Add github issue and PR templates

Signed-off-by: Adam.Dybbroe <adam.dybbroe@smhi.se>

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,18 @@
+#### Code Sample, a minimal, complete, and verifiable piece of code
+
+```python
+# Your code here
+
+```
+#### Problem description
+
+[this should also explain **why** the current behaviour is a problem and why the 
+expected output is a better solution.]
+
+#### Expected Output
+
+#### Actual Result, Traceback if applicable
+
+#### Versions of Python, package at hand and relevant dependencies
+
+Thank you for reporting an issue !

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please make the PR against the `develop` branch. -->
+
+<!-- Describe what your PR does, and why -->
+
+ - [ ] Closes #xxxx <!-- remove if there is no corresponding issue, which should only be the case for minor changes -->
+ - [ ] Tests added <!-- for all bug fixes or enhancements -->
+ - [ ] Tests passed <!-- for all non-documentation changes) -->
+ - [ ] Passes ``git diff origin/develop **/*py | flake8 --diff`` <!-- remove if you did not edit any Python files -->
+ - [ ] Fully documented <!-- remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later -->