Add README instructions

roschaefer · roschaefer · commit d0b631749dd4 · 2018-04-25T16:30:23.000+02:00
diff --git a/README.md b/README.md
@@ -31,3 +31,10 @@ Or
 ```sh
 yarn start
 ```
+
+## Test
+
+Run:
+```
+yarn test
+```
