Add git repository to package.json

This will create a link from NPM back to the project GitHub page. This will make things more discoverable.

package.json

@@ -3,6 +3,10 @@
   "version": "0.0.13",
   "description": "",
   "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git@github.com:joltup/react-native-threads.git"
+  },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },