Added Angular entry to top-level README, added blurbs for each screencast
Added Angular entry to top-level README, added blurbs for each screencast

bsrungarakavi/screencasts,gtdeng/screencasts,Dmytro-Oliynyk/screencasts,peterwu8/screencasts,bsaideepak/D3_screencasts_Curran_Kelleher,ralic/screencasts,sprdave/screencasts,nathan-j-brenner/screencasts,antonxuanquang/screencasts,device82/curran_kelleher_web_screencast,bsrungarakavi/screencasts,PhongHPham/screencasts,gtdeng/screencasts,souravsaha1605/screencasts,antonxuanquang/screencasts,sidathgithub/screencasts,SuThaw/screencasts,pdevashish29/screencasts,Vardhan17/screencasts,neelshah23/screencasts,janisg/screencasts,rapala61/screencasts,oddyisback/screencasts,theclinicdotcom/screencasts,curran/screencasts,jack4dev/screencasts,mromarreyes/screencasts,chiu/screencasts,Dim73/screencasts,Dim73/screencasts,rahmangithub/screencasts,bsrungarakavi/screencasts,SourenaSahraian/screencasts,ralic/screencasts,ghostkissboy/screencasts,RBroden/screencasts,Zvika88/screencasts,curran/screencasts,jack4dev/screencasts,janisg/screencasts,impari/screencasts,bsaideepak/D3_screencasts_Curran_Kelleher,suhas1294/screencasts,everyding/screencasts,oddyisback/screencasts,ektx/screencasts,janisg/screencasts,RBroden/screencasts,Dmytro-Oliynyk/screencasts,nathan-j-brenner/screencasts,tpsumeta/screencasts,Vardhan17/screencasts,TomCorto/screencasts,mromarreyes/screencasts,kabeertest/screencasts,Dim73/screencasts,SourenaSahraian/screencasts,rhamid/screencasts,rhamid/screencasts,nathan-j-brenner/screencasts,TobiasGouldenSchultz/screencasts,rapala61/screencasts,prashen/screencasts,jiangzhixiao/screencasts,HattrickNZ/screencasts,Muruganpari/screencasts,rapala61/screencasts,atre7/screencasts,Sweetymeow/screencasts,ghostkissboy/screencasts,everyding/screencasts,vrajroham/screencasts,Sweetymeow/screencasts,Zvika88/screencasts,peterwu8/screencasts,coco90417/screencasts,kabeertest/screencasts,dbirchak/screencasts,monogut/screencasts,prashen/screencasts,Sweetymeow/screencasts,atre7/screencasts,SourenaSahraian/screencasts,gtdeng/screencasts,prashen/screencasts,sprdave/screencasts,rhamid/screencasts,ralic/screencasts,vetional/screencasts,anweshknayak/screencasts,oliver-feng/screencasts,bformet/screencasts,jack4dev/screencasts,tpsumeta/screencasts,chiu/screencasts,vrajroham/screencasts,Zvika88/screencasts,ektx/screencasts,impari/screencasts,mromarreyes/screencasts,rahmangithub/screencasts,coco90417/screencasts,pdevashish29/screencasts,pdevashish29/screencasts,monogut/screencasts,Vardhan17/screencasts,imjayca/screencasts,oliver-feng/screencasts,TomCorto/screencasts,imjayca/screencasts,vetional/screencasts,theclinicdotcom/screencasts,tpsumeta/screencasts,anweshknayak/screencasts,Dmytro-Oliynyk/screencasts,HattrickNZ/screencasts,everyding/screencasts,peterwu8/screencasts,HattrickNZ/screencasts,ghostkissboy/screencasts,suhas1294/screencasts,SuThaw/screencasts,kod3r/screencasts,RBroden/screencasts,imjayca/screencasts,bsaideepak/D3_screencasts_Curran_Kelleher,Muruganpari/screencasts,pastorenue/screencasts,curran/screencasts,souravsaha1605/screencasts,antonxuanquang/screencasts,souravsaha1605/screencasts,theclinicdotcom/screencasts,atre7/screencasts,vetional/screencasts,Muruganpari/screencasts,oliver-feng/screencasts,kod3r/screencasts,dbirchak/screencasts,SuThaw/screencasts,sidathgithub/screencasts,sidathgithub/screencasts,coco90417/screencasts,kod3r/screencasts,vrajroham/screencasts,impari/screencasts,anweshknayak/screencasts,rahmangithub/screencasts,device82/curran_kelleher_web_screencast,TomCorto/screencasts,neelshah23/screencasts,neelshah23/screencasts,PhongHPham/screencasts,pastorenue/screencasts,monogut/screencasts,bformet/screencasts,TobiasGouldenSchultz/screencasts,sprdave/screencasts,dbirchak/screencasts,jiangzhixiao/screencasts,pastorenue/screencasts,ektx/screencasts,device82/curran_kelleher_web_screencast,chiu/screencasts,kabeertest/screencasts,oddyisback/screencasts,jiangzhixiao/screencasts,PhongHPham/screencasts,suhas1294/screencasts,TobiasGouldenSchultz/screencasts