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README.md

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+# Dropshell Build
+
+## Installation
+
+First install dropshell-tool, then:
+```
+dropshell-tool install dropshell-build
+```
+
+If you wish to use local toolchain (rather than docker):
+```
+install_dropshell_build_requirements
+```
+
+## Use
+
+```
+dropshell-build [-r] [-m] DIRECTORY
+```
+
+where `DIRECTORY` is the path to your `CMakeLists.txt`, `-r` specifies release version (rather than debug), and `-m` builds for multiple architectures (rather than just the host arch).
+
+
+## Notes
+
+- Cross-Builds with musl (from https://musl.cc )
+- Uses DIRECTORY/CMakeLists.txt
+- Temporary build files go in DIRECTORY/build
+- Output files (executables) go in DIRECTORY/output
+- Will use local toolchain if it exits, otherwise docker