Added all files

examples/013_wait_for/database.yml

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+---
+- hosts: database
+  become: true
+  tasks:
+    - name: install tools
+      apt: name={{item}} state=present update_cache=yes
+      with_items:
+        - python3-mysqldb
+
+    - name: install mysql-server
+      apt: name=mysql-server state=present update_cache=yes
+
+    - name: ensure mysql started
+      service: name=mysql state=started enabled=yes
+
+    - name: ensure mysql listening on all ports
+      lineinfile: dest=/etc/mysql/my.cnf regexp=^bind-address line="bind-address = 0.0.0.0"
+      notify: restart mysql
+
+    - name: create demo database
+      mysql_db: name=demo state=present
+
+    - name: create demo user
+      mysql_user: name=demo password=demo priv=demo.*:ALL host='%' state=present
+
+  handlers:
+    - name: restart mysql
+      service: name=mysql state=restarted