add README.md to tests directory

Author: aesclever

tests/README.md

@@ -0,0 +1,18 @@
+# Test Automation
+
+## Selenium extension 
+
+For automation testing, Selenium web extension is added to the browser.
+
+**Generate test cases:**
+
+- Open the Selenium extension from the browser
+- Specify the base url e.g. http://localhost:3432
+- Start the recording and click through the Weather app
+- Stop the recording and save test file 
+
+**Load and run tests:**
+- Open the Selenium extension from the browser
+- Open save *.side file
+- Start the test
+