Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+- Want to contribute to [spotify-downloader](https://github.com/ritiek/spotify-downloader)?
+That's great. We are happy to have you!
+- Here is a basic outline on opening issues and making PRs:
+
+## Opening Issues
+
+- Search for your problem in the
+[issues section](https://github.com/ritiek/spotify-downloader/issues)
+before opening a new ticket. It might be already answered and save both you and us time. :smile:
+- Provide as much information as possible when opening your ticket, including any relevant examples (if any).
+- If your issue is a *bug*, make sure you pass `--log-level=DEBUG` when invoking
+`spotdl.py` and paste the output in your issue.
+- If you think your question is naive or something and you can't find anything related,
+don't feel bad. Open an issue any way!
+
+## Making Pull Requests
+
+- Look up for open issues and see if you can help out there.
+- Easy issues for newcomers are usually labelled as
+[good-first-issue](https://github.com/ritiek/spotify-downloader/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22).
+- When making a PR, point it to the [master branch](https://github.com/ritiek/spotify-downloader/tree/master)
+unless mentioned otherwise.
+- All tests are placed in the [test directory](https://github.com/ritiek/spotify-downloader/tree/master/test). We use [pytest](https://github.com/pytest-dev/pytest)
+to run the test suite: `$ python3 -m pytest test`.
+If you don't have pytest, you can install it with `$ pip3 install pytest`.
+- If you are planning to work on something big, let us know through an issue. So we can discuss more about it.
+- Lastly, please don't hesitate to ask if you have any questions!
+Let us know (through an issue) if you are facing any trouble making a PR, we'd be glad to help you out!
+
+## Related Resources
+
+- There's also a web-based front-end to operate this tool, which under (major) construction
+called [spotifube](https://github.com/linusg/spotifube).
+Check it out if you'd like to contribute to it!