Add FUNDING.json for project funding details (#2033)

FIL-Retro

Author: Reiers

FUNDING.json

@@ -0,0 +1,7 @@
+{
+  "drips": {
+    "filecoin": {
+      "ownedBy": "0xa36EcC2989E594e246BE46D0020F04F3afe8ADad"
+    }
+  }
+}