add readme

README.md

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+# Usage
+
+# Download
+
+### Specific Package
+
+1. Run `./pip-install <your-package>`.
+
+## Publish
+
+1. Make sure have the all package you will publish in the same folder (`whl` files).
+2. Run `./pip-install <nexus_host> <repository>`.
+3. After published, the all packages and json file will remove.