mesh: Add README file

    This file contains instructions for Bluetooth mesh daemon
    configuration and description of the persistent storage.

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+Bluetooth Mesh Daemon
+*********************
+
+Copyright (C) 2019  Intel Corporation. All rights reserved.
+
+Compilation and installation
+============================
+
+In addition to main BlueZ requirements, MeshCtl needs the following:
+	- json-c library
+
+Configuration and options
+=========================
+
+	--enable-mesh
+
+		Build mesh daemon and other Bluetooth Mesh based tools
+
+Current implementation of the mesh daemon requires exclusive access to
+a Bluetooth controller.
+The AutoEnable option in the installed main.conf should be set to "false".
+
+Storage
+=======
+
+Default storage directory is /var/lib/bluetooth/mesh.
+
+The directory contains the provisioned nodes configurations.
+Each node has its own subdirectory, named with a 4-digit (hexadecimal)
+identificator that is internally generated by the mesh daemon at the time
+of the node provisioning.
+
+Each subdirectory contains the following files:
+	- node.json:
+		node configuration and is populated by the
+		daemon based on the configuration commands from a
+		provisioner/configuration client
+	- node.json.bak:
+		a backup that the last known good node configuration.
+
+The files are in JSON format.
+
+Information
+===========
+
+Mailing lists:
+	linux-bluetooth@vger.kernel.org
+
+For additional information about the project visit BlueZ web site:
+	http://www.bluez.org
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