Create funding.json

RPGF4 Repo Verificiation

Author: BurtRock

funding.json

@@ -0,0 +1,5 @@
+{
+  "opRetro": {
+    "projectId": "0x945e356d400d37b4cd548ca3b53d4ee41a075c8b4befd0b8589947b6d8721ad4"
+  }
+}