Add example script to build and run example

Author: hdgarrood

README.md

@@ -21,7 +21,7 @@ main = launchAff do
   liftEff $ print files'
 ```
 
-That was easy. Run `gulp example` to see it work.
+That was easy. Run `npm run example` to see it work.
 
 #### Documentation
 

package.json

@@ -2,7 +2,8 @@
   "private": true,
   "scripts": {
     "postinstall": "pulp dep install",
-    "build": "pulp build && rimraf docs && pulp docs"
+    "build": "pulp build && rimraf docs && pulp docs",
+    "example": "pulp run -I example --main Example.Main"
   },
   "devDependencies": {
     "pulp": "^4.0.2",