add npm aliases (#5290)

plugins/npm/npm.plugin.zsh

@@ -20,3 +20,10 @@ alias npmE='PATH="$(npm bin)":"$PATH"'
 
 # Check which npm modules are outdated
 alias npmO="npm outdated"
+
+# Run npm start
+alias npmst="npm start"
+
+# Run npm test
+alias npmt="npm test"
+