Merge pull request #53 from gelatodigital/chore/add-funding-json

feat: add funding.json

Author: KostasCherv

funding.json

@@ -0,0 +1,5 @@
+{
+  "opRetro": {
+    "projectId": "0x7697147650b4b717ce5675982f2102da7c030498628fe37e3f403f875622b7f7"
+  }
+}