Add Github issue template

Author: l-lin

CONTRIBUTING.md renamed to .github/CONTRIBUTING.md

@@ -0,0 +1,20 @@
+Before you write your question, please take some extra time to write a good title that is short yet descriptive.
+
+## What are the versions you are using?
+
+- jquery version:
+- datatables version: 
+- angular-datatables version:
+
+## What's the problem?
+
+Describe your issue and be specific, especially in reproduction steps.
+Try to consistently reproduce your issue — in a clean environment.
+
+## Can you share your code?
+
+Write your example code using [Markdown](https://help.github.com/articles/github-flavored-markdown) syntax. Really, it's not difficult...
+If you can, a [plnkr](http://plnkr.co/), [jsfiddle](https://jsfiddle.net/), [codepen](http://codepen.io/) or something alike is even better!
+
+Forgive me for being blunt, but if you can't follow this simple issue template (especially the code), don't expect me to help you efficiently!!! 
+