feat: go example

go/README.md

@@ -0,0 +1,6 @@
+# Go Example
+You can run this example using
+```bash
+OIDC_CLIENT_ID=<id> OIDC_CLIENT_SECRET=<secret> OIDC_ISSUER=<issuer> APP_BASE_URL=<base url> go run main.go
+```
+replacing `<base url>` with the URL of the backend