Adding documentation about git init (facebook#5296)

ryancogswell · Timer · commit f6c61b8da6d2 · 2018-10-04T22:40:28.000-04:00
diff --git a/template/README.md b/template/README.md
@@ -164,6 +164,8 @@ Read instructions below for using assets from JavaScript and HTML.
 You can, however, create more top-level directories.<br>
 They will not be included in the production build so you can use them for things like documentation.
 
+If you have Git installed and your project is not part of a larger repository, then a new repository will be initialized resulting in an additional `.git/` top-level directory.
+
 ## Available Scripts
 
 In the project directory, you can run:
