Create CONTRIBUTING.md for project contributions

Author: splincode

CONTRIBUTING.md

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+# Contributing Guide
+
+Thank you for your interest in contributing to our project! We welcome all contributions, from bug reports to new features.
+
+This guide will help you get started quickly.
+
+## How to Contribute
+
+There are several ways to contribute, even if you don't want to write code.
+
+1.  **Report a Bug:** Open an issue to tell us about something that's broken.
+2.  **Suggest a Feature:** Open an issue to propose a new idea.
+3.  **Fix a Bug or Implement a Feature:** Submit a Pull Request (PR) with your code changes.
+
+## Quick Start for Code Contributions
+
+If you're ready to submit code, follow these steps:
+
+### 1. Find an Issue
+Look through the [open issues](../../issues) to find something you'd like to work on. If you're new, look for labels like `good first issue` or `help wanted`. If you want to work on something new, **please open an issue to discuss it first** before writing code.
+
+### 2. Fork the Repository
+Click the "Fork" button in the top right of this repository's page. This creates your own copy of the project under your GitHub account.
+
+### 3. Clone Your Fork
+Clone your forked repository to your local machine.
+
+```bash
+git clone https://github.com/angular-ru/sdk.git
+cd repository-name
+```