Initial commit

README.md

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+## Build instructions
+
+```sh
+cmake -B build
+make -C build
+```
+
+Pass `-DCMAKE_BUILD_TYPE=Debug` or `-DCMAKE_BUILD_TYPE=Release` to
+`cmake` to select the according build configuration.
+
+This builds a CLI that can be then found in `./build/bin/katja`.