Added Github issue template.

Author: shazron

CONTRIBUTING.md renamed to .github/CONTRIBUTING.md

@@ -0,0 +1,24 @@
+## MUST READ BEFORE YOU FILE (DELETE THIS SECTION BEFORE FILING)
+
+Include the **command line arguments** you used for ios-sim.
+
+Don't forget to check out the [README](https://github.com/phonegap/ios-sim/blob/master/README.md) before filing this issue, to see if there are any known issues.
+
+# Expected behavior
+
+
+# Actual behavior.
+
+
+# Steps to reproduce the problem
+
+
+# System Specs
+
+Please run the commands below in your Terminal.app and include it in the issue. Check when done and include results below.
+
+- [ ] 1. sw_vers -productVersion
+- [ ] 2. ios-sim --version
+- [ ] 3. xcodebuild -version
+- [ ] 4. xcode-select --print-path
+- [ ] 5. gcc --version