adding correct way to test local templates

CONTRIBUTING.md

@@ -100,12 +100,12 @@ node /path/to/snowpack/create-snowpack-app/cli [my-new-dir] --template @snowpack
 
 To test a local version of the `create-snowpack-app` templates use
 
-NOTE This does not work, trying to figure this one out
-
 ```bash
-npx create-snowpack-app [my-new-dir] --template /path/to/template
+npx create-snowpack-app [my-new-dir] --template ./path/to/template
 ```
 
+Note the path must start with must start with a `.` to be considered local
+
 The `--verbose` flag enables additional logs which will help to identify the source of a problem. The `--reload` will clear the local cache which might have been created by a different `snowpack` version. Learn more about [Snowpack's CLI flags](https://www.snowpack.dev/#cli-flags).
 
 ## Discussion