Update README.md

Author: hangfei

README.md

@@ -12,6 +12,27 @@ While the core adk-python repository provides a stable, focused framework for bu
 
 This approach allows the core ADK to remain stable and lightweight, while giving the community the freedom to build and share powerful extensions.
 
+## 🚀 Installation
+
+### Stable Release (Recommended)
+
+You can install the latest stable version using `pip`:
+
+```bash
+pip install google-adk-community
+```
+
+This version is recommended for most users as it represents the most recent official release.
+
+### Development Version
+Bug fixes and new features are merged into the main branch on GitHub first. If you need access to changes that haven't been included in an official PyPI release yet, you can install directly from the main branch:
+
+```bash
+pip install git+https://github.com/google/adk-python-community.git@main
+```
+
+Note: The development version is built directly from the latest code commits. While it includes the newest fixes and features, it may also contain experimental changes or bugs not present in the stable release. Use it primarily for testing upcoming changes or accessing critical fixes before they are officially released.
+
 # Repository Structure
 The repository is organized into modules that mirror the structure of the core ADK, making it easy to find what you need: