Update git clone command in README.md under contribution

SergeAstapov · web-flow · commit c755bf4a82f5 · 2024-07-08T20:00:54.000-07:00
diff --git a/README.md b/README.md
@@ -57,7 +57,7 @@ Contributing
 
 ### Installation
 
-* `git clone <repository-url>`
+* `git clone https://github.com/emberjs/ember-test-helpers.git`
 * `cd ember-test-helpers`
 * `yarn install`
 
