Create ISSUE_TEMPLATE.MD

Author: swalters

ISSUE_TEMPLATE.MD

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+Please make sure each of the following is true before submitting a new issue.  We are a small team with limited time and it is very difficult to manage issues if they aren't reported correctly.
+
+- [ ] This is a bug report, not a question on how to use the grid.  
+Use [Stack Overflow](http://stackoverflow.com/questions/tagged/angular-ui-grid) or [Gitter](https://gitter.im/angular-ui/ui-grid) for questions.
+- [ ] You have searched the open issues to see if this bug has been filed before.  We don't want duplicate issues.
+- [ ] You have reviewed the tutorials and documentation to ensure you are using the grid correctly. [ui-grid.info](http://ui-grid.info/docs/#/tutorial)
+- [ ] You are using the latest version of the grid. Older versions are not patched or supported.
+- [ ] You have provided steps to recreate your bug.  A plunkr is even better.