readme update

Author: ivansfdc

README.md

@@ -3,7 +3,7 @@ design-system-react
 
 Future home of SLDS-React components
 
-### Usage
+## Usage
 
 ```
 npm install
@@ -47,6 +47,14 @@ import {SLDSPicklistBase} from 'design-system-react';
 [![browser support](/readme-assets/SLDSDatePickerBase.gif)](/readme-assets/SLDSDatePickerBase.gif)
 
 
+
+## Tests
+
+```
+npm test
+```
+
+
 ### Future Pipeline
 * Lookups
 * Modals