add README to copybara config

GitOrigin-RevId: 07b6d968d5

tools/copybara/copy.bara.sky

@@ -14,7 +14,7 @@ core.workflow(
         push = "master",
     ),
     # Change path to the folder you want to publish publicly
-    origin_files = glob(["tools/**", "Shared/**", "Jumpy.Shared/**"]),
+    origin_files = glob(["README.md", "tools/**", "Shared/**", "Jumpy.Shared/**"]),
 
     authoring = authoring.pass_thru("Unknown Author <nobody@semicolin.games>"),