Add user doc of template generator

Change-Id: Ie824b4eb0b1971edc29055b9e2565b0fd9ef36b3

doc/source/user/index.rst

@@ -3,6 +3,7 @@ Heat Dashboard User Documentation
 =================================
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 2
 
    stacks.rst
+   template_generator.rst

doc/source/user/template_generator.rst

@@ -0,0 +1,51 @@
+======================================
+Generate a Heat Orchestration Template
+======================================
+
+Heat Dashboard provides a user-friendly interface to generate
+Heat Orchestration templates in a Drag and Drop way.
+
+
+Generate a template
+~~~~~~~~~~~~~~~~~~~
+
+#. Log in to the dashboard.
+#. On the :guilabel:`Project` tab, open the :guilabel:`Orchestration`
+   tab and click :guilabel:`Template Generator` category.
+#. Wait until the page is completely loaded. It may take several seconds.
+#. Click the dropdown menu of Template Version, and choose an
+   appropriate version.
+#. Drag icons of resource types at the top of the page to the central
+   canvas.
+#. Click icons on the canvas to specify properties of resources.
+#. Click EDIT button at the top of the canvas, to enable manipulate mode.
+#. When in manipulate mode, click on CONNECT button to add an edge between
+   icons.
+#. Click edges to show details of connections.
+#. Click the Generate Template button at the top-right of the page and 
+   generated template will be shown in a text box. You can also add 
+   modification to the template here.
+#. Click CREATE STACK to jump to continue to :guilabel:`Launch Stack`.
+#. Click DOWNLOAD STACK to download the generated template.
+#. You can also click the Manage Drafts button at the top-right of the
+   page, to temporarily save the editing canvas or to load a saved one.
+
+
+Currently Supported resource types
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+13 types of resources are supported in the first release of Heat Dashboard.
+
+#. OS::Cinder::Volume
+#. OS::Cinder::VolumeAttachment
+#. OS::Heat::ResourceGroup
+#. OS::Neutron::FloatingIP
+#. OS::Neutron::FloatingIPAssociation
+#. OS::Neutron::Net
+#. OS::Neutron::Port
+#. OS::Neutron::Router
+#. OS::Neutron::RouterInterface
+#. OS::Neutron::SecurityGroup
+#. OS::Neutron::Subnet
+#. OS::Nova::KeyPair
+#. OS::Nova::Server