Added all files

examples/001_apt/database.yml

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+---
+- hosts: database
+  tasks:
+    - name: install mysql-server
+      apt: name=mysql-server state=present update_cache=yes

examples/001_apt/hostname.yml

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+---
+  - hosts: all
+    tasks:
+      - name: get server hostname
+        command: hostname

examples/001_apt/hosts

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+[database]
+192.168.0.2
+
+[loadbalancer]
+192.168.0.3

examples/001_apt/loadbalancer.yml

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+---
+- hosts: loadbalancer
+  tasks:
+    - name: install nginx
+      apt: name=nginx state=present update_cache=yes