updating readme with the cmds to execute the tests

Author: Lairon Acosta Guardias

README.md

@@ -6,6 +6,7 @@ Set of common packages used by all or most projects in my repositories.
 - [Implementation examples](#implementation-examples)
     - [Postgresql](#postgresql)
     - [Redis](#redis)
+- [Testing](#testing)
 
 ## Implementation examples
 
@@ -17,5 +18,22 @@ See the examples already implemented in the folder `/postgresql`.
 
 See the examples already implemented in the folder `/redis`.
 
+### Testing
+
+To run the tests simply execute the following command:
+
+```shell
+make test
+```
+
+This will stop any containers defined by the compose file for tests if already running
+and then rebuild the containers using the compose file.
+
+To down the containers simply execute the following command:
+
+```shell
+make test-down
+```
+
 lairon14@gmail.com  
 -- Lairon