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README.md

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+## How to setup the runner
+
+Place a `.env` file with the following contents in the root dir:
+
+```env
+GITEA_INSTANCE_LEVEL_TOKEN=PLACE_YOUR_GITEA_RUNNER_REGISTRATION_TOKEN_HERE
+```
+
+## How to start the runner
+
+Start with: 
+
+```sh
+sudo docker compose up -d
+```
+
+When you want to rebuild the runner (this creates a new runner) run: 
+
+```sh
+sudo docker compose up --build -d
+```