Add some missing details to package.json

package.json

@@ -1,6 +1,12 @@
 {
   "name": "resin-supervisor",
+  "description": "This is resin.io's Supervisor, a program that runs on IoT devices and has the task of running user Apps (which are Docker containers), and updating them as Resin's API informs it to.",
   "version": "2.7.0",
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/resin-io/resin-supervisor.git"
+  },
   "scripts": {
     "start": "./entry.sh",
     "build": "coffee -c src",