Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to mdbook-template
+
+Thank you for your interest in contributing to this project! I really appreciate it!
+
+# Got a Question?
+
+Please raise an issue with the `question` label. This ensures that bugs are separated from genuine questions.
+
+# Found an Issue or Bug?
+
+Please raise an issue on if you think you have found any issues or bugs. Even better, it would be great
+to submit a Pull Request including the fix.