Added 'Building HTMLBars' and 'How to Run Tests' sections to README
Added 'Building HTMLBars' and 'How to Run Tests' sections to README

chancancode/htmlbars,cgvarela/htmlbars,tildeio/glimmer,glimmerjs/glimmer-vm,code0100fun/htmlbars,chadhietala/glimmer,Kuzirashi/htmlbars,stefanpenner/htmlbars,chadhietala/glimmer,kublaj/htmlbars,jayphelps/htmlbars,step2yeung/htmlbars,chancancode/htmlbars,duggiefresh/htmlbars,davidgoli/htmlbars,GavinJoyce/htmlbars,lbdm44/glimmer-vm,glimmerjs/glimmer-vm,step2yeung/htmlbars,GavinJoyce/htmlbars,simudream/htmlbars,mmun/htmlbars,tildeio/htmlbars,greyhwndz/htmlbars,greyhwndz/htmlbars,jayphelps/htmlbars,xcskier56/htmlbars,SerkanSipahi/htmlbars,chadhietala/glimmer,tildeio/htmlbars,salzhrani/htmlbars,salzhrani/htmlbars,glimmerjs/glimmer-vm,cgvarela/htmlbars,rodrigo-morais/htmlbars,SerkanSipahi/htmlbars,code0100fun/htmlbars,davidgoli/htmlbars,vinngn1/htmlbars,simudream/htmlbars,mixonic/htmlbars,xcskier56/htmlbars,vinngn1/htmlbars,chadhietala/glimmer,lbdm44/glimmer-vm,Kuzirashi/htmlbars,tildeio/glimmer,stefanpenner/htmlbars,tildeio/glimmer,duggiefresh/htmlbars,rodrigo-morais/htmlbars,kublaj/htmlbars,mixonic/htmlbars,lbdm44/glimmer-vm