Explaining Unit and Acceptance Suite (#6)

Co-authored-by: ThomasLandauer <thomas@landauer.at>

Author: TavoNiievez

README.md

@@ -1,7 +1,7 @@
 # Codeception Symfony Module Tests
 Minimal site containing functional tests for [Codeception Module Symfony](https://github.com/Codeception/module-symfony).
 
-### Installation
+## Installation
 
 1. Clone the repo
    ```shell
@@ -21,3 +21,11 @@ Minimal site containing functional tests for [Codeception Module Symfony](https:
    ```shell
    vendor/bin/codecept run Functional
    ```
+
+### Create Unit Suite or Acceptance Suite
+
+To create [Unit Tests](https://codeception.com/docs/05-UnitTests) or [Acceptance Tests](https://codeception.com/docs/03-AcceptanceTests), you need to create the corresponding suite first:
+```shell
+vendor/bin/codecept generate:suite Unit
+vendor/bin/codecept generate:suite Acceptance
+```