docs(readme): create readme

readme.md

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+# Keymap image generation
+
+## Prerequisites
+
+- `uv` to manage python package
+- `make`
+
+## How to generate images
+
+`make` will locally install
+[`keymap-drawer`](https://github.com/caksoylar/keymap-drawer)
+in `.venv` using `uv` and compile the different keymaps.