Add Bug Reporting and Resources to README
Add Bug Reporting and Resources to README

Copied Bug Reporting and Resources sections from Openfire and edited links to go to Spark instead.
igniterealtime/Spark,speedy01/Spark,guusdk/Spark,igniterealtime/Spark,igniterealtime/Spark,wrooot/Spark,wrooot/Spark,guusdk/Spark,igniterealtime/Spark,guusdk/Spark,speedy01/Spark,guusdk/Spark,speedy01/Spark,speedy01/Spark,wrooot/Spark,wrooot/Spark