Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+<!--
+Fill in the information below before opening an issue.
+If you have a question, please consider emailing the mailing list:
+    https://groups.google.com/forum/#!forum/emcee-users
+-->
+
+**General information:**
+
+- emcee version:
+- platform:
+- installation method (pip/conda/source/other?):
+
+**Problem description:**
+
+### Expected behavior:
+
+### Actual behavior:
+
+### What have you tried so far?:
+
+### Minimal example:
+
+<!-- In this section, you should include or link to a code snippet that demonstrates this issue. -->
+
+```python
+import emcee
+
+# sample code goes here...
+```