add blue archive gacha simulator cog with live banners and wiki portraits

README.md

@@ -28,4 +28,5 @@ run these to see the sub-commands:
 - `!music` — music playback controls
 - `!sysinfo` — hardware monitoring
 - `!gifs` — the gif list 
-- `!fun` — the junk commands
+- `!fun` — the junk commands
+- `!gacha` — blue archive recruitment simulator (pick banners, pull with live rates)