Contributing docs for Github. (#12)

.github/issue_template.md

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+### Environemnt
+
+Operating system: 
+
+Python version: 
+
+LAKEsuperior release, branch, or commit #: 
+
+### Steps to reproduce
+
+(describe your actions)
+
+### Observed behavior
+
+(describe the results)
+
+### Expected behavior
+
+(describe what you expected to see)
+
+### Other notes worth mentioning
+
+(any other context details that may be affecting your outcome)

.github/pull_request_template.md

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+Fixes #
+
+Changes in this pull request:
+
+- 
+
+Notes & caveats:
+
+- 
+
+@scossu