Add issue and PR templates

.github/ISSUE_TEMPLATE.md

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+### What did you do?
+
+### What did you expect to happen?
+
+### What actually happened?
+
+### What versions of OS, Python and pylast are you using?
+
+Please include **code** that reproduces the issue.
+
+The [best reproductions](https://stackoverflow.com/help/mcve) are [self-contained scripts](https://ericlippert.com/2014/03/05/how-to-debug-small-programs/) with minimal dependencies.
+
+```python
+code goes here
+```

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #
+
+Changes proposed in this pull request:
+
+ * 
+ * 
+ *