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README.md

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 <h1 align="center">Krait2</h1>
-<p>a flexible tool for microsatellite investigation and visualization</p>
+<p align="center">a flexible tool for microsatellite investigation and visualization</p>
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     <a href="https://app.codacy.com/gh/lmdu/krait2/dashboard?utm_source=gh&utm_medium=referral&utm_content=&utm_campaign=Badge_grade">
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+## Introduction
+
+Krait is a flexible and powerful tool with a user-friendly graphic interface for genome-wide identification of microsatellites. Krait is written in Python and can be run as a standalone desktop application on Windows, Linux or MacOS systems without installation of dependencies.
+
+## Documentation
+
+The documentation is available here: [https://krait2.readthedocs.io/en/latest](https://krait2.readthedocs.io/en/latest/)
+
+## Download
+
+You can download the latest installer for Windows, Linux and MacOS from [https://github.com/lmdu/krait2/releases](https://github.com/lmdu/krait2/releases)
+
+中国镜像下载地址: [https://big.cdu.edu.cn/software/krait2](https://big.cdu.edu.cn/software/krait2)