Add readme for tests

Author: M65649

test/readme.md

@@ -0,0 +1,13 @@
+# Testing the examples  
+
+This folder is for testing the example sketches against expected output and thus provide an integration test for each example sketch.
+
+## Setup 
+
+Install the python packages needed: `pip install -r requirements.txt`
+
+## Running
+
+* Run all tests: `pytest . --port <device_port> -s`
+* Run a test for a specific example sketch: `pytest . --port <device_port> -s test_<sketch_name_without_dot_ino>`. For example for `debug_modem`: `pytest . --port COM7 -s test_debug_modem`
+