Create README.md

Author: da-liii

README.md

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+# S7 Scheme Binary
+## Installation
+On windows, just download it and rename it to `s7.exe`.
+
+On Linux/macOS, we suggest that you should download the binary to `$HOME/bin/s7`.
+
+```
+mkdir -p $HOME/bin
+wget https://github.com/XmacsLabs/s7-scheme-binary/releases/download/v20230413.0/s7_macosx_arm64 -O $HOME/bin/s7
+chmod +x $HOME/bin/s7
+```
+
+## Versioning
+For example, `v20230413.0` means we are using the S7 scheme on 2023/04/13. And `0` identifies the packager script version.