Simplified the issue template

- Removed "Prerequisites" section as the links are not very useful in a markdown editing section.
- Issue prerequisites are addressed in the README.
- Re: issues #1 and #2

Author: emxsys

ISSUE_TEMPLATE.md

@@ -1,10 +1,3 @@
-### _Prerequisites_
-_Please fulfill the following requirements before submitting an issue to this repository._
-
-- Check the [Common Problems wiki](https://github.com/WorldWindEarth/WorldWindJava/wiki/Common-Problems)
-- Check that your issue isn't already filed: https://github.com/WorldWindEarth/WorldWindJava/issues?q=is%3Aopen
-- Check the [WorldWind Java Forums](https://forum.worldwindcentral.com/forum/world-wind-java-forums) for common solutions
-
 ### Description
 
 **Expected behavior:**