Split the use cases

Split the use cases into two sentences and linked each use case to the right part of the website.

README.md

@@ -1,6 +1,6 @@
 # chaintip-github
 The ChainTip github bot
 
-This bot allows you to send Bitcoin Cash tips to other GitHub users. It also allows you to tip issues and create bounties that users can claim by submitting a pull request that  fixes the tipped issue.
+This bot allows you to [send Bitcoin Cash tips](http://www.chaintip.org/github#send) to other GitHub users. 
 
-[Usage instructions](http://www.chaintip.org/github)
+It also allows you to [tip issues and create bounties](http://www.chaintip.org/github#tip-issue) that users can claim by submitting a pull request that  fixes the tipped issue.