Try to explain API further

README.md

@@ -18,5 +18,32 @@ $ dokku plugin:install https://github.com/decentral1se/dokku-ansible-playbook.gi
 All files must be placed within the `.ansible` folder of your git repository.
 
 * `requirements.yml`: what role dependencies to download before running your plays.
-* `pre-deploy.yml`: the play to run before the application is deployed.
-* `post-deploy.yml`: the play to run after the application is deployed.
+
+The following hooks are supported (add `.yml` to the hook name in `.ansible`):
+
+* `pre-deploy`
+* `post-deploy`
+* `create-app`
+
+## Example
+
+### .ansible/requirements.yml
+
+```yaml
+---
+- src: dokku_bot.ansible_dokku
+  version: v2020.3.15
+```
+
+### .ansible/create-app.yml
+
+```yaml
+---
+- hosts: all
+  tasks:
+    - name: Create foobar group
+      group:
+        name: foobar
+        system: true
+        state: present
+```