chore: add contrinbution guidelines

CONTRIBUTION_GUIDELINES.md

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+# Contribution Guidelines
+
+If you're planning to contribute, **please follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) standard.**
+
+Pull Requests (PRs) that do not adhere to this standard will **not be accepted**.
+
+## Branch Requirements
+
+- **All PRs must be based on the `dev` branch.**
+- Merges will only occur into the `dev` branch before being released to the main branch.
+
+## Commit Message Format
+
+Ensure your commit messages and PR titles use the following format:
+
+```
+<type>(<scope>): <description>
+```
+
+For example:  
+```
+feat(es_extended/client/main): sync where players look at
+fix(es_extended/client/functions): validate model is a vehicle
+refactor(es_extended/client/modules/death): replace gameEventTriggered
+```
+
+Common commit types include:  
+- **`feat`** for new features  
+- **`fix`** for bug fixes  
+- **`refactor`** for code improvements without functionality changes  
+- **`!`** to indicate breaking changes (e.g., `feat!` or `fix!`)
+
+---
+
+## PR Checklist
+
+**Please include this in your PR.**
+```
+- [ ]  My commit messages and PR title follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) standard.
+- [ ]  My changes have been tested locally and function as expected.
+- [ ]  My PR does not introduce any breaking changes.
+- [ ]  I have provided a clear explanation of what my PR does, including the reasoning behind the changes and any relevant context.
+```
+
+
+# We value your contribution!
+By adhering to these guidelines, we can ensure a clean and maintainable codebase. Thank you for contributing to ESX!