Add events documentation to the README.
Add events documentation to the README.

jimmycuadra/lita,sadiqmmm/lita,mcgain/lita,litaio/lita,litaio/lita,natesholland/lita,byroot/lita,elia/lita,PatrickTulskie/lita,chriswoodrich/lita,liamdawson/lita,jaisonerick/lita,jimmycuadra/lita,byroot/lita,tristaneuan/lita,liamdawson/lita,sadiqmmm/lita,mcgain/lita,MatthewKrey/lita,natesholland/lita,chriswoodrich/lita,tristaneuan/lita,brodock/lita,jaisonerick/lita,crimsonknave/lita,elia/lita,MatthewKrey/lita,crimsonknave/lita,brodock/lita,prsimp/lita