cli: Add config instructions to create-github-app command

Signed-off-by: Johan Haals <johan.haals@gmail.com>

.changeset/fuzzy-seahorses-teach.md

@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Add instructions to `create-github-app` command.

packages/cli/src/commands/create-github-app/index.ts

@@ -35,5 +35,15 @@ export default async (org: string) => {
       'This file contains sensitive credentials, it should not be committed to version control and handled with care!',
     ),
   );
-  // TODO: log instructions on how to use the newly created app configuration.
+  console.log(
+    "Here's an example on how to update the integrations section in app-config.yaml",
+  );
+  console.log(
+    chalk.green(`
+integrations:
+  github:
+    - host: github.com
+      apps:
+        - $include: ${fileName}`),
+  );
 };