Add Grails sample app

Closes gh-250

samples/rest-notes-grails/grails-app/controllers/com/example/IndexController.groovy

@@ -0,0 +1,31 @@
+package com.example
+
+import grails.core.GrailsApplication
+import grails.util.Environment
+
+class IndexController {
+
+    GrailsApplication grailsApplication
+
+    def index() {
+        render(contentType: 'application/json') {
+            message = "Welcome to Grails!"
+            environment = Environment.current.name
+            appversion = grailsApplication.metadata['info.app.version']
+            grailsversion = grailsApplication.metadata['info.app.grailsVersion']
+            appprofile = grailsApplication.config.grails?.profile
+            groovyversion = GroovySystem.getVersion()
+            jvmversion = System.getProperty('java.version')
+            controllers = array {
+                for (c in grailsApplication.controllerClasses) {
+                    controller([name: c.fullName])
+                }
+            }
+            plugins = array {
+                for (p in grailsApplication.mainContext.pluginManager.allPlugins) {
+                    plugin([name: p.fullName])
+                }
+            }
+        }
+    }
+}