adds link to discourse

As suggested by @empaempa in https://github.com/ipfs/pm/issues/451#issuecomment-300397134

README.md

@@ -3,7 +3,7 @@
 [![ipfs](https://img.shields.io/badge/irc-%23ipfs-brightgreen.svg)](https://webchat.freenode.net/?channels=ipfs)
 [![Changelog #204](https://img.shields.io/badge/changelog-%23204-lightgrey.svg)](https://changelog.com/204)
 
-Welcome to IPFS! Why not [watch a video demo](https://www.youtube.com/watch?v=8CMxDNuuAiQ) to get started?
+Welcome to IPFS! Why not [watch a video demo](https://www.youtube.com/watch?v=8CMxDNuuAiQ) to get started? Please post questions and ideas at http://discuss.ipfs.io
 
 ## Table of Contents