Create ISSUE_TEMPLATE.md

Author: jreback

.github/ISSUE_TEMPLATE.md

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+## Pandas Issue Submission Template
+
+This template will help you and us respond to your issues in an efficient and timely manner.
+Please fill out all sections and use [github markdown for code blocks](https://help.github.com/articles/basic-writing-and-formatting-syntax/)
+
+#### Actual Behavior
+
+#### Expected Behavior
+
+#### output of ``pd.show_versions()``