imporved readme

Author: timea-solid

README.md

@@ -119,6 +119,14 @@ When you want to test the component within a solid-pane, you can use the [develo
 
 ## Adding Tests
 
+One can run extisting tests with:
+```
+npm run test
+```
+or with coverage
+```
+npm run test-coverage
+```
 The following document gives guidance on how to add and perform testing in solid-ui.
 [Testing in solid-ui](https://github.com/SolidOS/solid-ui/blob/18070a02fa8159a2b83d9503ee400f8e046bf1f6/test/unit/README.md)