Added API docs link to README.
Added API docs link to README.

zensh/ejs,zensh/ejs,insidewarehouse/ejs,xanxiver/ejs,cnwhy/ejs,kolonse/ejs,jtsay362/solveforall-ejs2,tyduptyler13/ejs,operatino/ejs,TimothyGu/ejs-tj,insidewarehouse/ejs,TimothyGu/ejs-tj,mde/ejs,mmis1000/ejs-promise,kolonse/ejs,cnwhy/ejs,rpaterson/ejs