Feat: add mpd role and enable it to nas

roles/mpd/molecule/default/INSTALL.rst

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+*********************************
+Vagrant driver installation guide
+*********************************
+
+Requirements
+============
+
+* Vagrant
+* Virtualbox, Parallels, VMware Fusion, VMware Workstation or VMware Desktop
+
+Install
+=======
+
+Please refer to the `Virtual environment`_ documentation for installation best
+practices. If not using a virtual environment, please consider passing the
+widely recommended `'--user' flag`_ when invoking ``pip``.
+
+.. _Virtual environment: https://virtualenv.pypa.io/en/latest/
+.. _'--user' flag: https://packaging.python.org/tutorials/installing-packages/#installing-to-the-user-site
+
+.. code-block:: bash
+
+    $ pip install 'molecule_vagrant'

roles/mpd/molecule/default/converge.yml

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+---
+- name: Converge
+  hosts: all
+  tasks:
+    - name: "Include mpd"
+      include_role:
+        name: "mpd"

roles/mpd/molecule/default/molecule.yml

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+---
+dependency:
+  name: galaxy
+driver:
+  name: vagrant
+platforms:
+  - name: instance
+provisioner:
+  name: ansible
+verifier:
+  name: ansible

roles/mpd/molecule/default/verify.yml

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+---
+# This is an example playbook to execute Ansible tests.
+
+- name: Verify
+  hosts: all
+  gather_facts: false
+  tasks:
+  - name: Example assertion
+    assert:
+      that: true