broadcity: add MR and MST

"The Hit&Run rate is at least 0.5 for each torrent, regardless of category and features. You have to seed every torrent at least that rate.
You must seed every torrent for at least 2 days if you cannot provide a shipping amount."
https://broadcity.in/rules.php

src/Jackett.Common/Definitions/broadcity.yml

@@ -123,4 +123,9 @@ search:
       case:
         img[src$="/x2.gif"]: 2
         "*": 1
+    minimumratio:
+      text: 0.5
+    minimumseedtime:
+      # 2 days (as seconds = 2 x 24 x 60 x 60)
+      text: 172800
 # TS Special Edition v.7.5