Update README.md

README.md

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 # sd-colab-commands-browser
 SD Web UI Extension for Run Command Manually
+To install it, clone the repo into the `extensions` directory and run colab:
+
+`!git clone https://github.com/Iyashinouta/sd-colab-commands-browser /content/stable-diffusion-webui/extensions/sd-colab-commands-browser`