Create CONTRIBUTING.md (#216)

Signed-off-by: Piotr Gajek <[email protected]>

Author: pgajek2

CONTRIBUTING.md

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+# Contributing to SOQL Lib
+
+Thank you for considering contributing to the **SOQL Lib** project! 🙌  
+We welcome contributions that improve performance, add features, fix bugs, or enhance documentation and tests.
+
+## 🚀 How to Contribute
+
+To contribute to this project, please follow the standard GitHub fork-and-pull workflow:
+
+### 1. Fork the Repository
+
+Start by [forking the repository](https://github.com/beyond-the-cloud-dev/soql-lib/fork) to your own GitHub account.
+
+### 2. Clone Your Fork
+
+```bash
+git clone https://github.com/YOUR_USERNAME/soql-lib.git
+cd soql-lib
+```
+### 3. Create a New Branch
+
+```bash
+git checkout -b feature/my-awesome-feature
+```
+
+### 4. Make Your Changes
+
+Make your changes in the appropriate files. Please follow the current coding style and conventions used in the codebase.
+
+If you’re updating logic, add or update unit tests.
+
+### 5. Commit and Push
+
+```bash
+git add .
+git commit -m "feat: add support for XYZ feature"
+git push origin feature/my-awesome-feature
+```
+
+### 6. Open a Pull Request
+
+Open a Pull Request (PR) from your fork to the main branch of the original repository:
+
+```
+https://github.com/beyond-the-cloud-dev/soql-lib
+```
+
+- Base: `main`
+- Compare: your feature branch
+
+Add the code example to the PR description.
+
+### 7. Add Reviewer
+
+Please add @pgajek2 as a reviewer to your PR.
+
+## ✅ Pull Request Checklist
+
+Before submitting your PR, make sure you’ve:
+- Written clear and concise commit messages
+- Followed existing code style and naming conventions
+- Added or updated relevant documentation (if applicable)
+- Added or updated unit tests (if applicable)
+- Verified that all existing tests pass