test: added test-documentation as a submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "test-documentaion"]
+	path = test-documentaion
+	url = [email protected]:matter-labs/test-documentation.git

README.md

@@ -108,7 +108,10 @@ To get block-explorer connected to your ZK Stack Hyperchain you need to set up a
 To verify front-end `App` is running open http://localhost:3010 in your browser. `API` should be available at http://localhost:3020, `Worker` at http://localhost:3001 and `Data Fetcher` at http://localhost:3040.
 
 ## 🕵️‍♂️ Testing
-Run unit tests for all packages:
+To navigate to the test documentation, go to [test-documentation](./test-documentation)
+*make sure that you have downloaded the progect with `git clone --recursive` option. 
+*if you already have the cloned repo you can use `git submodule update --init --recursive` to get submodules.
+
 ```bash
 npm run test
 ```