Add CONTRIBUTING.md

Also add CLA.md with pull request reusable action

Author: BOLL7708

.github/workflows/cla-validation.yaml

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+name: CLA Validation
+
+on:
+  pull_request_target:
+  
+jobs:
+  validate-cla:
+    uses: BOLL7708/reusable_workflows/.github/workflows/cla-validator.yaml@use
+    permissions:
+      contents: read
+      pull-requests: write

CLA.md

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+# Contributor License Agreement (CLA)
+
+This agreement ensures that all contributions can be used under the project's [MIT][MIT] license.
+
+By adding your GitHub username to the list below, you agree to the following:
+
+- You license your contributions to this project under the MIT license.
+- This agreement applies to all your contributions: past, present, and future.
+- You will only submit code that you have the rights to license.
+- This agreement is perpetual and cannot be revoked.
+
+[MIT]: https://mit-license.org/
+
+## Signed Contributors
+Add your GitHub username as a new entry at the end of the list. Do not alter other entries, and leave one blank line below yours.
+
+- BOLL7708

CONTRIBUTING.md

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+# Contributing
+
+Thank you for helping improve this project.
+
+## How to Contribute
+- Open a pull request with your changes.
+  - Sign the Contributor License Agreement (CLA) by adding your GitHub username to the bottom of [`CLA.md`](CLA.md) in your pull request.
+    - This is required for your pull request to be accepted. You only need to sign once.