[engines guide] Credit where credit is due + explaning directory structure
[engines guide] Credit where credit is due + explaning directory structure

sergey-alekseev/rails,xlymian/rails,voray/rails,alecspopa/rails,starknx/rails,lcreid/rails,samphilipd/rails,yhirano55/rails,aditya-kapoor/rails,yhirano55/rails,jeremy/rails,MSP-Greg/rails,vassilevsky/rails,tgxworld/rails,pvalena/rails,vassilevsky/rails,gcourtemanche/rails,yawboakye/rails,kddeisz/rails,MichaelSp/rails,tjschuck/rails,hanystudy/rails,sergey-alekseev/rails,Spin42/rails,palkan/rails,kaspth/rails,bradleypriest/rails,assain/rails,illacceptanything/illacceptanything,rails/rails,stefanmb/rails,voray/rails,marklocklear/rails,yasslab/railsguides.jp,deraru/rails,eileencodes/rails,arjes/rails,yawboakye/rails,notapatch/rails,rails/rails,prathamesh-sonpatki/rails,kmcphillips/rails,yahonda/rails,yhirano55/rails,voray/rails,mtsmfm/rails,xlymian/rails,Envek/rails,kenta-s/rails,aditya-kapoor/rails,mtsmfm/railstest,prathamesh-sonpatki/rails,yalab/rails,vipulnsward/rails,kmcphillips/rails,bradleypriest/rails,gauravtiwari/rails,gfvcastro/rails,illacceptanything/illacceptanything,Sen-Zhang/rails,utilum/rails,kachick/rails,yahonda/rails,Edouard-chin/rails,gauravtiwari/rails,Erol/rails,betesh/rails,alecspopa/rails,ledestin/rails,baerjam/rails,notapatch/rails,iainbeeston/rails,ttanimichi/rails,coreyward/rails,ngpestelos/rails,illacceptanything/illacceptanything,flanger001/rails,amoody2108/TechForJustice,elfassy/rails,gavingmiller/rails,shioyama/rails,pvalena/rails,sealocal/rails,repinel/rails,jeremy/rails,printercu/rails,rails/rails,fabianoleittes/rails,lcreid/rails,illacceptanything/illacceptanything,deraru/rails,rafaelfranca/omg-rails,yhirano55/rails,printercu/rails,Sen-Zhang/rails,stefanmb/rails,elfassy/rails,kddeisz/rails,georgeclaghorn/rails,starknx/rails,hanystudy/rails,BlakeWilliams/rails,88rabbit/newRails,assain/rails,kmcphillips/rails,esparta/rails,shioyama/rails,esparta/rails,alecspopa/rails,illacceptanything/illacceptanything,tjschuck/rails,yahonda/rails,rafaelfranca/omg-rails,betesh/rails,deraru/rails,printercu/rails,starknx/rails,Erol/rails,joonyou/rails,felipecvo/rails,gavingmiller/rails,koic/rails,mijoharas/rails,rafaelfranca/omg-rails,lucasmazza/rails,travisofthenorth/rails,pschambacher/rails,jeremy/rails,joonyou/rails,tijwelch/rails,arunagw/rails,repinel/rails,hanystudy/rails,rossta/rails,illacceptanything/illacceptanything,bolek/rails,kmcphillips/rails,gfvcastro/rails,pschambacher/rails,mathieujobin/reduced-rails-for-travis,ngpestelos/rails,MichaelSp/rails,mathieujobin/reduced-rails-for-travis,kachick/rails,Vasfed/rails,joonyou/rails,schuetzm/rails,shioyama/rails,brchristian/rails,rails/rails,illacceptanything/illacceptanything,BlakeWilliams/rails,brchristian/rails,gfvcastro/rails,kaspth/rails,travisofthenorth/rails,Erol/rails,untidy-hair/rails,fabianoleittes/rails,felipecvo/rails,marklocklear/rails,koic/rails,ledestin/rails,shioyama/rails,bradleypriest/rails,coreyward/rails,kmayer/rails,schuetzm/rails,pschambacher/rails,bogdanvlviv/rails,jeremy/rails,assain/rails,kmayer/rails,coreyward/rails,prathamesh-sonpatki/rails,yasslab/railsguides.jp,mathieujobin/reduced-rails-for-travis,iainbeeston/rails,lcreid/rails,yawboakye/rails,pvalena/rails,BlakeWilliams/rails,iainbeeston/rails,MSP-Greg/rails,illacceptanything/illacceptanything,flanger001/rails,yasslab/railsguides.jp,mtsmfm/rails,lucasmazza/rails,rbhitchcock/rails,utilum/rails,odedniv/rails,MSP-Greg/rails,arjes/rails,illacceptanything/illacceptanything,betesh/rails,tgxworld/rails,baerjam/rails,baerjam/rails,richseviora/rails,bogdanvlviv/rails,Envek/rails,repinel/rails,tjschuck/rails,Stellenticket/rails,fabianoleittes/rails,yalab/rails,kachick/rails,mtsmfm/rails,kddeisz/rails,vipulnsward/rails,Erol/rails,EmmaB/rails-1,untidy-hair/rails,aditya-kapoor/rails,utilum/rails,rossta/rails,kamipo/rails,untidy-hair/rails,notapatch/rails,matrinox/rails,mijoharas/rails,kamipo/rails,georgeclaghorn/rails,tijwelch/rails,illacceptanything/illacceptanything,riseshia/railsguides.kr,matrinox/rails,ngpestelos/rails,mtsmfm/railstest,baerjam/rails,illacceptanything/illacceptanything,arunagw/rails,mohitnatoo/rails,riseshia/railsguides.kr,yasslab/railsguides.jp,travisofthenorth/rails,Edouard-chin/rails,repinel/rails,kenta-s/rails,tgxworld/rails,georgeclaghorn/rails,bolek/rails,esparta/rails,rossta/rails,schuetzm/rails,kddeisz/rails,palkan/rails,mohitnatoo/rails,yawboakye/rails,mijoharas/rails,lcreid/rails,gauravtiwari/rails,brchristian/rails,koic/rails,lucasmazza/rails,vassilevsky/rails,Envek/rails,88rabbit/newRails,deraru/rails,travisofthenorth/rails,maicher/rails,kamipo/rails,pvalena/rails,eileencodes/rails,riseshia/railsguides.kr,ttanimichi/rails,illacceptanything/illacceptanything,fabianoleittes/rails,Edouard-chin/rails,vipulnsward/rails,utilum/rails,MSP-Greg/rails,sergey-alekseev/rails,Sen-Zhang/rails,notapatch/rails,odedniv/rails,eileencodes/rails,odedniv/rails,gfvcastro/rails,eileencodes/rails,samphilipd/rails,Edouard-chin/rails,kirs/rails-1,illacceptanything/illacceptanything,kmayer/rails,Vasfed/rails,ttanimichi/rails,assain/rails,mechanicles/rails,mechanicles/rails,Stellenticket/rails,sealocal/rails,arunagw/rails,samphilipd/rails,mohitnatoo/rails,EmmaB/rails-1,Vasfed/rails,rbhitchcock/rails,kaspth/rails,palkan/rails,marklocklear/rails,aditya-kapoor/rails,joonyou/rails,xlymian/rails,BlakeWilliams/rails,georgeclaghorn/rails,mtsmfm/railstest,88rabbit/newRails,yalab/rails,Spin42/rails,amoody2108/TechForJustice,untidy-hair/rails,prathamesh-sonpatki/rails,gcourtemanche/rails,illacceptanything/illacceptanything,rbhitchcock/rails,riseshia/railsguides.kr,maicher/rails,iainbeeston/rails,bolek/rails,tjschuck/rails,betesh/rails,elfassy/rails,schuetzm/rails,vipulnsward/rails,EmmaB/rails-1,ledestin/rails,felipecvo/rails,gavingmiller/rails,arjes/rails,Spin42/rails,amoody2108/TechForJustice,yahonda/rails,esparta/rails,maicher/rails,mechanicles/rails,flanger001/rails,tgxworld/rails,palkan/rails,kenta-s/rails,bogdanvlviv/rails,richseviora/rails,kirs/rails-1,yalab/rails,printercu/rails,sealocal/rails,tijwelch/rails,arunagw/rails,richseviora/rails,gcourtemanche/rails,kirs/rails-1,Vasfed/rails,mechanicles/rails,MichaelSp/rails,Stellenticket/rails,mohitnatoo/rails,Envek/rails,matrinox/rails,bogdanvlviv/rails,Stellenticket/rails,illacceptanything/illacceptanything,stefanmb/rails,flanger001/rails