Add CREDITS.md with proper acknowledgments

Author: Alex72-py

CREDITS.md

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+# Credits
+
+This project, **Gemini CLI for Termux**, is a fork of the original [Gemini CLI](https://github.com/google-gemini/gemini-cli) repository.
+
+## Original Authors
+- **Google Gemini Team**: The primary developers and maintainers of the original Gemini CLI.
+- **Google LLC**: The copyright holder of the original source code.
+
+## Fork Maintainer
+- **Alex72-py**: Adapted the codebase for Android/Termux compatibility.
+
+## License
+The original code is licensed under the **Apache License 2.0**. This fork continues to be licensed under the same terms. You can find the full license text in the [LICENSE](LICENSE) file.
+
+## Changes in this Fork
+- Modified `packages/core/src/utils/secure-browser-launcher.ts` to support `termux-open-url`.
+- Added `termux-install.sh` for automated dependency management on Android.
+- Updated documentation to reflect Termux-specific usage.
+
+We thank the Google Gemini team for their open-source contribution which made this mobile adaptation possible.