Add CONTRIBUTING.md and CHANGELOG.md (#30)

CHANGELOG.md

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+# Top of tree
+
+* Added config files - now defaults for the CL options can be customized with
+  local config files (#32).
+* Added a feature to customize branch names for stacked PRs (#33).
+* Fixed a bug with branches not being deleted when a stack is abandoned (#27).
+* Subcommands outputs is suppressed for less spammy look (#26).
+
+# Version 0.1.2

CONTRIBUTING.md

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+# Contributions
+
+Thank you for your interest in contributing to this project! We appreciate the time and effort you're willing to invest.
+
+## Filing Issues
+
+If you encounter bugs or have suggestions, please feel free to open an issue. Clear, detailed reports help us fix things faster!
+
+## Pull Requests (PRs)
+
+We welcome PRs for bug fixes, enhancements, and new features. Please fork the repository and submit your PR when you're ready. Be sure to check the existing issues to see if a similar change is already being worked on.
+
+Please note that the project is maintained during our team's available time, so responses and reviews might take a little longer. We will review all contributions and respond as soon as possible.
+
+When your PR is ready to be merged, one of our team members will merge it on your behalf.
+
+Thank you for contributing and helping to improve this project. We look forward to seeing your ideas!