docs: Add FreeBSD build notes link to doc/README.md
docs: Add FreeBSD build notes link to doc/README.md

tjps/bitcoin,Xekyo/bitcoin,andreaskern/bitcoin,practicalswift/bitcoin,DigitalPandacoin/pandacoin,ahmedbodi/vertcoin,CryptArc/bitcoin,wellenreiter01/Feathercoin,droark/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,prusnak/bitcoin,myriadcoin/myriadcoin,untrustbank/litecoin,mruddy/bitcoin,myriadteam/myriadcoin,mitchellcash/bitcoin,cdecker/bitcoin,ajtowns/bitcoin,prusnak/bitcoin,bitcoinknots/bitcoin,gjhiggins/vcoincore,bitcoinsSG/bitcoin,GroestlCoin/bitcoin,FeatherCoin/Feathercoin,wellenreiter01/Feathercoin,Xekyo/bitcoin,instagibbs/bitcoin,andreaskern/bitcoin,namecoin/namecore,jlopp/statoshi,midnightmagic/bitcoin,apoelstra/bitcoin,kallewoof/bitcoin,namecoin/namecore,OmniLayer/omnicore,midnightmagic/bitcoin,lateminer/bitcoin,GroestlCoin/GroestlCoin,fanquake/bitcoin,domob1812/namecore,kallewoof/bitcoin,anditto/bitcoin,fujicoin/fujicoin,rnicoll/bitcoin,myriadteam/myriadcoin,GroestlCoin/bitcoin,jonasschnelli/bitcoin,instagibbs/bitcoin,anditto/bitcoin,tecnovert/particl-core,MeshCollider/bitcoin,yenliangl/bitcoin,dscotese/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,apoelstra/bitcoin,rnicoll/bitcoin,mitchellcash/bitcoin,domob1812/bitcoin,sstone/bitcoin,rnicoll/bitcoin,andreaskern/bitcoin,alecalve/bitcoin,jnewbery/bitcoin,cdecker/bitcoin,jtimon/bitcoin,rnicoll/dogecoin,myriadteam/myriadcoin,pstratem/bitcoin,qtumproject/qtum,tjps/bitcoin,achow101/bitcoin,nikkitan/bitcoin,bitcoin/bitcoin,practicalswift/bitcoin,instagibbs/bitcoin,fujicoin/fujicoin,AkioNak/bitcoin,particl/particl-core,dscotese/bitcoin,litecoin-project/litecoin,untrustbank/litecoin,sstone/bitcoin,sipsorcery/bitcoin,DigitalPandacoin/pandacoin,mm-s/bitcoin,bitcoin/bitcoin,fanquake/bitcoin,Sjors/bitcoin,achow101/bitcoin,yenliangl/bitcoin,mitchellcash/bitcoin,lateminer/bitcoin,n1bor/bitcoin,FeatherCoin/Feathercoin,EthanHeilman/bitcoin,afk11/bitcoin,midnightmagic/bitcoin,prusnak/bitcoin,Sjors/bitcoin,apoelstra/bitcoin,litecoin-project/litecoin,kallewoof/bitcoin,achow101/bitcoin,wellenreiter01/Feathercoin,FeatherCoin/Feathercoin,jonasschnelli/bitcoin,sstone/bitcoin,cdecker/bitcoin,pataquets/namecoin-core,jonasschnelli/bitcoin,midnightmagic/bitcoin,jamesob/bitcoin,Sjors/bitcoin,bitcoinsSG/bitcoin,anditto/bitcoin,JeremyRubin/bitcoin,yenliangl/bitcoin,mruddy/bitcoin,mitchellcash/bitcoin,namecoin/namecore,andreaskern/bitcoin,instagibbs/bitcoin,jambolo/bitcoin,JeremyRubin/bitcoin,gjhiggins/vcoincore,rnicoll/bitcoin,GroestlCoin/bitcoin,dscotese/bitcoin,peercoin/peercoin,domob1812/bitcoin,jambolo/bitcoin,bitcoinknots/bitcoin,ElementsProject/elements,mm-s/bitcoin,dscotese/bitcoin,tecnovert/particl-core,jlopp/statoshi,jnewbery/bitcoin,ahmedbodi/vertcoin,midnightmagic/bitcoin,myriadcoin/myriadcoin,Xekyo/bitcoin,qtumproject/qtum,qtumproject/qtum,MarcoFalke/bitcoin,yenliangl/bitcoin,alecalve/bitcoin,ahmedbodi/vertcoin,litecoin-project/litecoin,namecoin/namecoin-core,pstratem/bitcoin,rnicoll/bitcoin,wellenreiter01/Feathercoin,rnicoll/dogecoin,nikkitan/bitcoin,alecalve/bitcoin,jambolo/bitcoin,tjps/bitcoin,namecoin/namecore,jnewbery/bitcoin,MeshCollider/bitcoin,mruddy/bitcoin,afk11/bitcoin,litecoin-project/litecoin,namecoin/namecoin-core,r8921039/bitcoin,domob1812/namecore,tecnovert/particl-core,mitchellcash/bitcoin,droark/bitcoin,bitcoinknots/bitcoin,rnicoll/bitcoin,fanquake/bitcoin,myriadcoin/myriadcoin,gjhiggins/vcoincore,jonasschnelli/bitcoin,mm-s/bitcoin,vertcoin/vertcoin,mruddy/bitcoin,GroestlCoin/bitcoin,wellenreiter01/Feathercoin,rnicoll/dogecoin,bespike/litecoin,MarcoFalke/bitcoin,r8921039/bitcoin,untrustbank/litecoin,myriadcoin/myriadcoin,namecoin/namecore,myriadteam/myriadcoin,fanquake/bitcoin,rnicoll/dogecoin,peercoin/peercoin,cdecker/bitcoin,OmniLayer/omnicore,peercoin/peercoin,instagibbs/bitcoin,vertcoin/vertcoin,pstratem/bitcoin,apoelstra/bitcoin,prusnak/bitcoin,ElementsProject/elements,GroestlCoin/GroestlCoin,litecoin-project/litecoin,MarcoFalke/bitcoin,MarcoFalke/bitcoin,apoelstra/bitcoin,qtumproject/qtum,monacoinproject/monacoin,practicalswift/bitcoin,ajtowns/bitcoin,GroestlCoin/bitcoin,bespike/litecoin,fujicoin/fujicoin,particl/particl-core,CryptArc/bitcoin,EthanHeilman/bitcoin,fanquake/bitcoin,tjps/bitcoin,droark/bitcoin,bitcoinsSG/bitcoin,Xekyo/bitcoin,ajtowns/bitcoin,pataquets/namecoin-core,apoelstra/bitcoin,jnewbery/bitcoin,MeshCollider/bitcoin,mruddy/bitcoin,tjps/bitcoin,kallewoof/bitcoin,myriadteam/myriadcoin,bespike/litecoin,ahmedbodi/vertcoin,nikkitan/bitcoin,bitcoin/bitcoin,kallewoof/bitcoin,jamesob/bitcoin,n1bor/bitcoin,vertcoin/vertcoin,jlopp/statoshi,JeremyRubin/bitcoin,pataquets/namecoin-core,r8921039/bitcoin,lateminer/bitcoin,JeremyRubin/bitcoin,n1bor/bitcoin,namecoin/namecoin-core,jonasschnelli/bitcoin,n1bor/bitcoin,droark/bitcoin,rnicoll/dogecoin,sstone/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,jtimon/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,practicalswift/bitcoin,EthanHeilman/bitcoin,achow101/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,OmniLayer/omnicore,untrustbank/litecoin,AkioNak/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,sipsorcery/bitcoin,tecnovert/particl-core,FeatherCoin/Feathercoin,andreaskern/bitcoin,DigitalPandacoin/pandacoin,pstratem/bitcoin,afk11/bitcoin,cdecker/bitcoin,MeshCollider/bitcoin,jamesob/bitcoin,particl/particl-core,anditto/bitcoin,jnewbery/bitcoin,bitcoin/bitcoin,monacoinproject/monacoin,nikkitan/bitcoin,prusnak/bitcoin,namecoin/namecore,qtumproject/qtum,monacoinproject/monacoin,bespike/litecoin,particl/particl-core,nikkitan/bitcoin,CryptArc/bitcoin,AkioNak/bitcoin,afk11/bitcoin,pstratem/bitcoin,jtimon/bitcoin,gjhiggins/vcoincore,afk11/bitcoin,EthanHeilman/bitcoin,CryptArc/bitcoin,dscotese/bitcoin,MeshCollider/bitcoin,fujicoin/fujicoin,qtumproject/qtum,jambolo/bitcoin,DigitalPandacoin/pandacoin,fujicoin/fujicoin,ahmedbodi/vertcoin,pataquets/namecoin-core,particl/particl-core,namecoin/namecoin-core,domob1812/bitcoin,vertcoin/vertcoin,lateminer/bitcoin,jlopp/statoshi,ajtowns/bitcoin,kallewoof/bitcoin,JeremyRubin/bitcoin,domob1812/namecore,myriadcoin/myriadcoin,jamesob/bitcoin,GroestlCoin/GroestlCoin,jambolo/bitcoin,sipsorcery/bitcoin,alecalve/bitcoin,droark/bitcoin,domob1812/bitcoin,vertcoin/vertcoin,CryptArc/bitcoin,AkioNak/bitcoin,r8921039/bitcoin,domob1812/namecore,monacoinproject/monacoin,domob1812/bitcoin,MarcoFalke/bitcoin,mruddy/bitcoin,myriadteam/myriadcoin,ahmedbodi/vertcoin,wellenreiter01/Feathercoin,prusnak/bitcoin,dscotese/bitcoin,OmniLayer/omnicore,jtimon/bitcoin,droark/bitcoin,bespike/litecoin,pataquets/namecoin-core,peercoin/peercoin,ElementsProject/elements,litecoin-project/litecoin,CryptArc/bitcoin,n1bor/bitcoin,achow101/bitcoin,DigitalPandacoin/pandacoin,EthanHeilman/bitcoin,sstone/bitcoin,ElementsProject/elements,anditto/bitcoin,mm-s/bitcoin,FeatherCoin/Feathercoin,ajtowns/bitcoin,alecalve/bitcoin,namecoin/namecoin-core,jlopp/statoshi,r8921039/bitcoin,JeremyRubin/bitcoin,Sjors/bitcoin,achow101/bitcoin,monacoinproject/monacoin,particl/particl-core,pstratem/bitcoin,OmniLayer/omnicore,alecalve/bitcoin,sstone/bitcoin,bitcoin/bitcoin,anditto/bitcoin,bitcoinsSG/bitcoin,bespike/litecoin,untrustbank/litecoin,untrustbank/litecoin,sipsorcery/bitcoin,sipsorcery/bitcoin,mm-s/bitcoin,jamesob/bitcoin,yenliangl/bitcoin,n1bor/bitcoin,tjps/bitcoin,monacoinproject/monacoin,myriadcoin/myriadcoin,domob1812/namecore,bitcoinknots/bitcoin,practicalswift/bitcoin,gjhiggins/vcoincore,jambolo/bitcoin,bitcoinknots/bitcoin,fujicoin/fujicoin,r8921039/bitcoin,yenliangl/bitcoin,OmniLayer/omnicore,ElementsProject/elements,gjhiggins/vcoincore,vertcoin/vertcoin,peercoin/peercoin,nikkitan/bitcoin,cdecker/bitcoin,mitchellcash/bitcoin,GroestlCoin/GroestlCoin,MeshCollider/bitcoin,jtimon/bitcoin,FeatherCoin/Feathercoin,domob1812/namecore,peercoin/peercoin,jamesob/bitcoin,MarcoFalke/bitcoin,GroestlCoin/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,EthanHeilman/bitcoin,Sjors/bitcoin,instagibbs/bitcoin,jtimon/bitcoin,AkioNak/bitcoin,fanquake/bitcoin,GroestlCoin/GroestlCoin,afk11/bitcoin,midnightmagic/bitcoin,domob1812/bitcoin,ElementsProject/elements,practicalswift/bitcoin,jlopp/statoshi,qtumproject/qtum,andreaskern/bitcoin,lateminer/bitcoin,GroestlCoin/GroestlCoin,DigitalPandacoin/pandacoin