added additional resolutions for hashtagicons, added #zap #lightning #amethyst

app/src/main/java/com/vitorpamplona/amethyst/model/HashtagIcon.kt

@@ -7,6 +7,10 @@ fun checkForHashtagWithIcon(tag: String): HashtagIcon? {
         return HashtagIcon(R.drawable.ht_btc, "Bitcoin", Color(0xFFF2A900))
     } else if (tag.lowercase() == "nostr") {
         return HashtagIcon(R.drawable.ht_nostr, "Nostr", Color(0xFF9C59FF))
+    } else if (tag.lowercase() == "zap" || tag.lowercase() == "zapathon" || tag.lowercase() == "lightning") {
+        return HashtagIcon(R.drawable.ht_zap, "Zap", Color(0xFFFFEC01))
+    } else if (tag.lowercase() == "amethyst") {
+        return HashtagIcon(R.drawable.ht_amethyst, "Amethyst", Color(0xFFb793e6))
     }
     return null
 }