Add Authsignal to passkeys directory (#75)

- Added authsignal.com to compatible-domains.json
- Enables Authsignal to appear in the community passkeys directory

Author: Ashutosh-Bhadauriya

resources/compatible-domains.json

@@ -8,6 +8,7 @@
     "apple.com",
     "arpari.com",
     "authgear.com",
+    "authsignal.com",
     "bestbuy.com",
     "beyondidentity.com",
     "binance.com",