Update Readme.md
Update Readme.md

Added instructions for browser REPL
whamtet/cljs-server-template,fdserr/mies,swannodette/mies,niwinz/mies,DjebbZ/mies,fdserr/mies,bensu/mies,bensu/mies,swannodette/mies,DjebbZ/mies,niwinz/mies