Mention asking questions in the README
Mention asking questions in the README

Asking questions using Issues isn't all that common, this adds a sentence to the `README` assuring people that it's fine and encouraged.
tonyli508/ReactiveCocoa,howandhao/ReactiveCocoa,ioshger0125/ReactiveCocoa,chieryw/ReactiveCocoa,kiurentu/ReactiveCocoa,howandhao/ReactiveCocoa,goodheart/ReactiveCocoa,brasbug/ReactiveCocoa,richeterre/ReactiveCocoa,natan/ReactiveCocoa,wangqi211/ReactiveCocoa,ericzhou2008/ReactiveCocoa,jeelun/ReactiveCocoa,victorlin/ReactiveCocoa,shaohung001/ReactiveCocoa,Ray0218/ReactiveCocoa,Ethan89/ReactiveCocoa,leichunfeng/ReactiveCocoa,sandyway/ReactiveCocoa,on99/ReactiveCocoa,sugar2010/ReactiveCocoa,wangqi211/ReactiveCocoa,ohwutup/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,zxq3220122/ReactiveCocoa,luerhouhou/ReactiveCocoa,tiger8888/ReactiveCocoa,nickcheng/ReactiveCocoa,SmartEncounter/ReactiveCocoa,lixar/ReactiveCocoa,Eveian/ReactiveCocoa,valleyman86/ReactiveCocoa,ailyanlu/ReactiveCocoa,nickcheng/ReactiveCocoa,Ray0218/ReactiveCocoa,dullgrass/ReactiveCocoa,xumaolin/ReactiveCocoa,Remitly/ReactiveCocoa,200895045/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,jam891/ReactiveCocoa,towik/ReactiveCocoa,stevielu/ReactiveCocoa,takeshineshiro/ReactiveCocoa,bscarano/ReactiveCocoa,add715/ReactiveCocoa,taylormoonxu/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,KJin99/ReactiveCocoa,gengjf/ReactiveCocoa,CQXfly/ReactiveCocoa,mxxiv/ReactiveCocoa,zhigang1992/ReactiveCocoa,clg0118/ReactiveCocoa,esttorhe/ReactiveCocoa,LHDsimon/ReactiveCocoa,OneSmallTree/ReactiveCocoa,Rupert-RR/ReactiveCocoa,JackLian/ReactiveCocoa,tonyarnold/ReactiveCocoa,ceekayel/ReactiveCocoa,zhukaixy/ReactiveCocoa,mattpetters/ReactiveCocoa,ceekayel/ReactiveCocoa,jeelun/ReactiveCocoa,DreamHill/ReactiveCocoa,windgo/ReactiveCocoa,bencochran/ReactiveCocoa,jrmiddle/ReactiveCocoa,emodeqidao/ReactiveCocoa,xiaoliyang/ReactiveCocoa,beni55/ReactiveCocoa,Remitly/ReactiveCocoa,richeterre/ReactiveCocoa,yoichitgy/ReactiveCocoa,esttorhe/ReactiveCocoa,Farteen/ReactiveCocoa,brasbug/ReactiveCocoa,ericzhou2008/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,icepy/ReactiveCocoa,SanChain/ReactiveCocoa,wpstarnice/ReactiveCocoa,windgo/ReactiveCocoa,bencochran/ReactiveCocoa,on99/ReactiveCocoa,Ricowere/ReactiveCocoa,qq644531343/ReactiveCocoa,eyu1988/ReactiveCocoa,fanghao085/ReactiveCocoa,isghe/ReactiveCocoa,kiurentu/ReactiveCocoa,BrooksWon/ReactiveCocoa,ceekayel/ReactiveCocoa,kaylio/ReactiveCocoa,huiping192/ReactiveCocoa,victorlin/ReactiveCocoa,tonyli508/ReactiveCocoa,sdhzwm/ReactiveCocoa,chao95957/ReactiveCocoa,qq644531343/ReactiveCocoa,isghe/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,bensonday/ReactiveCocoa,zhukaixy/ReactiveCocoa,dskatz22/ReactiveCocoa,KuPai32G/ReactiveCocoa,yonekawa/ReactiveCocoa,Pingco/ReactiveCocoa,Pikdays/ReactiveCocoa,Khan/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,JohnJin007/ReactiveCocoa,zhukaixy/ReactiveCocoa,imkerberos/ReactiveCocoa,AlanJN/ReactiveCocoa,monkeydbobo/ReactiveCocoa,stevielu/ReactiveCocoa,dachaoisme/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,brasbug/ReactiveCocoa,mtxs007/ReactiveCocoa,on99/ReactiveCocoa,towik/ReactiveCocoa,sandyway/ReactiveCocoa,jackywpy/ReactiveCocoa,kevin-zqw/ReactiveCocoa,ztchena/ReactiveCocoa,takeshineshiro/ReactiveCocoa,shaohung001/ReactiveCocoa,Juraldinio/ReactiveCocoa,yoichitgy/ReactiveCocoa,BrooksWon/ReactiveCocoa,buildo/ReactiveCocoa,stupidfive/ReactiveCocoa,SanChain/ReactiveCocoa,zzqiltw/ReactiveCocoa,natestedman/ReactiveCocoa,ztchena/ReactiveCocoa,tzongw/ReactiveCocoa,jackywpy/ReactiveCocoa,windgo/ReactiveCocoa,zhaoguohui/ReactiveCocoa,mattpetters/ReactiveCocoa,xiaobing2007/ReactiveCocoa,terry408911/ReactiveCocoa,victorlin/ReactiveCocoa,dz1111/ReactiveCocoa,Rupert-RR/ReactiveCocoa,add715/ReactiveCocoa,andersio/ReactiveCocoa,SuPair/ReactiveCocoa,xiaoliyang/ReactiveCocoa,imkerberos/ReactiveCocoa,Liquidsoul/ReactiveCocoa,zzzworm/ReactiveCocoa,Juraldinio/ReactiveCocoa,calebd/ReactiveCocoa,libiao88/ReactiveCocoa,cogddo/ReactiveCocoa,zzzworm/ReactiveCocoa,sujeking/ReactiveCocoa,bencochran/ReactiveCocoa,calebd/ReactiveCocoa,zhaoguohui/ReactiveCocoa,nickcheng/ReactiveCocoa,gengjf/ReactiveCocoa,fhchina/ReactiveCocoa,fanghao085/ReactiveCocoa,chao95957/ReactiveCocoa,jsslai/ReactiveCocoa,Ricowere/ReactiveCocoa,tornade0913/ReactiveCocoa,CQXfly/ReactiveCocoa,335g/ReactiveCocoa,longv2go/ReactiveCocoa,Khan/ReactiveCocoa,valleyman86/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,Pikdays/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,AlanJN/ReactiveCocoa,ztchena/ReactiveCocoa,icepy/ReactiveCocoa,ddc391565320/ReactiveCocoa,ohwutup/ReactiveCocoa,fhchina/ReactiveCocoa,andersio/ReactiveCocoa,BlessNeo/ReactiveCocoa,sujeking/ReactiveCocoa,calebd/ReactiveCocoa,tornade0913/ReactiveCocoa,goodheart/ReactiveCocoa,jrmiddle/ReactiveCocoa,200895045/ReactiveCocoa,yytong/ReactiveCocoa,chieryw/ReactiveCocoa,mtxs007/ReactiveCocoa,xulibao/ReactiveCocoa,hbucius/ReactiveCocoa,jeelun/ReactiveCocoa,KuPai32G/ReactiveCocoa,pzw224/ReactiveCocoa,takeshineshiro/ReactiveCocoa,cnbin/ReactiveCocoa,j364960953/ReactiveCocoa,yytong/ReactiveCocoa,clg0118/ReactiveCocoa,SmartEncounter/ReactiveCocoa,rpowelll/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,dullgrass/ReactiveCocoa,lixar/ReactiveCocoa,wpstarnice/ReactiveCo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