Add link to invite

docs/setup.rst

@@ -5,6 +5,13 @@ Setup/Options
    :maxdepth: 2
    :caption: Contents:
 
+Inviting to your server
+-----------------------
+
+Invite Astra by visiting the link below:
+
+https://discordapp.com/oauth2/authorize?client_id=303646783886852097&scope=bot&permissions=3148800
+
 Channel Output
 --------------