docs: update README.md

Signed-off-by: AtomicFS <vojtech.vesely@9elements.com>
9elements · Nov 20, 2024 · 2b5891d · 2b5891d
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 Example usage of [firmware-action](https://github.com/9elements/firmware-action).
 
+
+## How to use
+
+```bash
+git clone --depth 1 git@github.com:9elements/firmware-action-example.git
+cd firmware-action-example
+git submodule update --depth 1 --init --recursive
+firmware-action build --config=firmware-action.json --target=coreboot-example
+```