Add README for gitstats3 project

This README provides an overview of the gitstats3 project, including features, prerequisites, installation instructions, and usage examples.

README.md

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+# gitstats3
+
+**gitstats3** is a git history statistics generator, ported from Python 2 to Python 3.
+
+This project allows you to analyze and visualize various statistics from a git repository, such as commit activity, author contributions, and more. It is a fork of the original [gitstats](https://github.com/hoxu/gitstats) project, updated to work with modern Python environments.
+
+## Features
+
+- Generates detailed statistics and graphs from git repositories
+- Analyzes commit history, author contribution, file changes, and more
+- Output is visual and easy to share
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.x
+- Git (installed and available in your system path)
+
+### Installation
+
+Clone the repository:
+
+```sh
+git clone https://github.com/lechibang-1512/gitstats3.git
+cd gitstats3
+```
+
+Install required dependencies (if any):
+
+```sh
+pip install -r requirements.txt
+```
+
+### Usage
+
+To generate statistics for a git repository:
+
+```sh
+python gitstats <path-to-git-repo> <output-directory>
+```
+
+Example:
+
+```sh
+python gitstats /path/to/your/repo /path/to/output
+```
+
+This will analyze the git repository and generate an HTML report in the output directory.
+
+## License
+
+This project is a fork of [hoxu/gitstats](https://github.com/hoxu/gitstats). Please refer to the original project for licensing details.
+
+## Acknowledgements
+
+- Original author: [hoxu/gitstats](https://github.com/hoxu/gitstats)
+- Ported to Python 3 by [lechibang-1512](https://github.com/lechibang-1512)