Add Contribution Guidelines

Created the Contribution Guidelines file. The guidelines provide instructions for contributing to the project, including information on pull requests and issues.

.github/CONTRIBUTING.md

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+# Contribution Guidelines
+
+## Pull Requests
+
+- Appease the linter
+- Bump the version
+- Adjust the Readme according to your changes (if applicable)
+- No extra dependencies unless absolutely necessary
+- If you're fixing an issue, open an issue as well or link existing one
+
+## Issues
+
+- Use the issue templates
+- When requesting a feature, check it hasn't been rejected previously 
+- Provide screenshot if applicable
+
+## How else can I help?
+
+- Take part in troubleshooting and testing
+- Star the repo
+- Follow the maintainers