init commit

proto/store/activity.proto

@@ -0,0 +1,14 @@
+syntax = "proto3";
+
+package memos.store;
+
+option go_package = "gen/store";
+
+message ActivityMemoCommentPayload {
+  int32 memo_id = 1;
+  int32 related_memo_id = 2;
+}
+
+message ActivityPayload {
+  ActivityMemoCommentPayload memo_comment = 1;
+}