feat(app-store): Add Giphy app (#2580)

.env.example

@@ -14,6 +14,7 @@
 #   - STRIPE
 #   - TANDEM
 #   - ZOOM
+#   - GIPHY
 
 # - LICENSE *************************************************************************************************
 # Set this value to 'agree' to accept our license:
@@ -168,4 +169,9 @@ TANDEM_BASE_URL="https://tandem.chat"
 # @see https://github.com/calcom/cal.com/#obtaining-zoom-client-id-and-secret
 ZOOM_CLIENT_ID=
 ZOOM_CLIENT_SECRET=
+
+#   - GIPHY
+# Used for the Giphy integration
+# @see https://support.giphy.com/hc/en-us/articles/360020283431-Request-A-GIPHY-API-Key
+GIPHY_API_KEY=
 # *********************************************************************************************************