Add client setup instructions

README.md

@@ -0,0 +1,22 @@
+# Gitea Runner Debian Repository
+
+This repository provides Debian packages for `gitea-runner`.
+
+## Client Setup
+
+Add the repository to the client:
+
+```bash
+sudo tee /etc/apt/sources.list.d/gitea-runner.list >/dev/null <<'EOF'
+deb [trusted=yes] https://git.24unix.net/tracer/gitea-runner-deb/raw/branch/master/ ./
+EOF
+```
+
+Update APT and install the package:
+
+```bash
+sudo apt update
+sudo apt install gitea-runner
+```
+
+The installed service is named `gitea-runner`.