MNT: Add PR-Template and CONTRIBUTING.md

.github/pull_request_template.md

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+Thanks for contributing a pull request! Please make sure you have read the
+[contribution guidelines](https://mne.tools/dev/install/contributing.html)
+before submitting.
+
+Please be aware that we are a loose team of volunteers so patience is
+necessary. Assistance handling other issues is very welcome. We value all user
+contributions, no matter how minor they are. If we are slow to review, either
+the pull request needs some benchmarking, tinkering, convincing, etc. or more
+likely the reviewers are simply busy. In either case, we ask for your
+understanding during the review process.
+
+Again, thanks for contributing!
+
+#### Reference issue
+
+Example: Fixes #1234.
+
+#### What does this implement/fix?
+
+Explain your changes.
+
+#### Additional information
+
+Any additional information you think is important.

CONTRIBUTING.md

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+# Contributing to mne-qt-browser
+
+**Thank you very much for taking the time to contribute!** :+1::+1::+1:
+
+As this package is a subsidiarian of [MNE-Python](https://mne.tools/dev/index.html)
+its [guidelines](https://github.com/mne-tools/mne-python) for contributing apply as well.
+
+## Setting up development environment
+Follow the [instructions from mne-python](https://mne.tools/dev/install/contributing.html#setting-up-your-local-development-environment)
+and additionally install the dependencies for this repository:
+
+```
+pip install -r requirements_testing.txt
+```