README: add reference to nppcommunity on LightHouse

- Change url listing to say what the links are for
- Add reference for Lighthouse issue tracking account.

[#6 state:resolved]

Signed-off-by: Thell Fowler <git@tbfowler.name>

README

@@ -1,7 +1,8 @@
 Notepad++ Community Release
 ===========================
-http://github.com/npp-community/npp-community
-irc://irc.freenode.net:6667/notepad++
+Project page: http://github.com/npp-community/npp-community
+IRC Support: irc://irc.freenode.net:6667/notepad++
+Issue Tracking: http://nppcommunity.lighthouseapp.com
 
 Overview
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