chore: Add contributing.md

Author: Sirivasv

CONTRIBUTING.md

@@ -0,0 +1,42 @@
+# Contributing to bmssp-js
+
+Thank you for your interest in contributing to **bmssp-js**! Your help is appreciated.
+
+## Getting Started
+
+1. **Fork the repository** and clone it locally.
+2. Install dependencies:
+  ```bash
+  npm install
+  ```
+3. Create a new branch for your feature or bugfix:
+  ```bash
+  git checkout -b your-feature-name
+  ```
+
+## Development
+
+- Follow the existing code style and conventions.
+- Write clear, concise commit messages.
+- Add or update tests as appropriate.
+
+## Running Tests
+
+Run all tests with:
+```bash
+npm test
+```
+
+## Submitting Changes
+
+1. Push your branch to your fork.
+2. Open a pull request against the `main` branch.
+3. Describe your changes and reference any related issues.
+
+## Code of Conduct
+
+Please be respectful and considerate in all interactions.
+
+---
+
+Thank you for contributing!