docs: Basic autoupdater documentation

docs/features/autoupdater.rst

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+Autoupdater
+===========
+
+Infrastructure
+--------------
+
+We suggest to have following directory tree accessible via http:
+
+::
+
+    firmware/
+            stable/
+                    sysupgrade/
+                    factory/
+            snapshot/
+                    sysupgrade/
+                    factory/
+            experimental/
+                    sysupgrade/
+                    factory/
+
+The last level is generated by the Gluon build process. Do not forget
+to rename the ``<branch>.manifest`` into ``manifest`` inside of the
+sysupgrade directories.
+
+The server should be available via IPv6.
+
+Command Line
+------------
+
+::
+
+   # Update with some probability 
+   autoupdate
+
+:: 
+
+   # Force Update Check  
+   autoupdater -f