Create README.md

README.md

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+# Linux Kernel Source Tree
+
+Kernel source tree for AvaotaSBC-provided kernel builds.
+
+## Kernel Branches
+- [Linux 5.15](https://github.com/AvaotaSBC/linux/tree/linux-5.15)
+
+```
+Usage: init [OPTIONS]
+Build Kernel repo.
+
+Options:
+  -u, --url        URL               The url of kernel
+  -v, --version    VERSION           The version of kernel
+  -p, --patch      PATCHFILE         The patch file of kernel
+  -b, --branch     BRANCH NAME       The branch of dst kernel
+  -h, --help                         Show command help.
+```