Added support for Overseerr (#26)

* Update README.md

* adding support for overseerr

* fixed wrong dictionary

* changed readme.md to shorten line 34
changed container_config.py, users_groups_setp.py to
        change  puid from 13010 to 13009
changed setup.sh changed puid for overseerr to 13009 and fixed
        chown command to use overeerr ID
changed main.py to only ask overeerr question if plex is chosen

users_groups_setup.py

@@ -87,3 +87,9 @@ class UserGroupSetup:
     def qbittorrent(self):
         os.system('sudo useradd qbittorrent -u 13007')
         os.system('sudo usermod -a -G mediacenter qbittorrent')
+
+    def overseerr(self):
+        os.system('sudo useradd overseerr -u 13009')
+        self.create_config_dir('overseerr')
+        os.system('sudo usermod -a -G mediacenter overseerr')
+