feat: dzgui 7 alpha

docs/source/usage.rst

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+Usage
+=========
+
+It is always advised to have Steam running in the background. DZGUI is meant to run "on top of" Steam.
+
+DZGUI can be launched in one of three ways.
+
+From a terminal
+------------------
+
+Invoke the command ``./dzgui.sh`` from wherever you downloaded the DZGUI script to.
+
+Launching from a terminal may give more verbose information in the event of a crash, and can be a good way of troubleshooting problems.
+
+From the shortcut shipped with the application
+--------------------------------------------------
+
+On most distributions, if you are using a desktop environment based on the Freedesktop specification, shortcuts will be installed for you.
+
+- One shortcut is located under the ``Games`` category of your system’s applications list/start menu.
+- The other is accessed via the ``DZGUI`` desktop icon (Steam Deck only)
+
+From Steam
+--------------
+See :doc:`steam`.