Add npm package metadata

Author: charlesmudy

package.json

@@ -30,5 +30,17 @@
     "notifications",
     "transactional",
     "promotional"
+  ],
+  "homepage": "https://github.com/yournotify/yournotify-node-sdk",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/yournotify/yournotify-node-sdk.git"
+  },
+  "bugs": {
+    "url": "https://github.com/yournotify/yournotify-node-sdk/issues"
+  },
+  "files": [
+    "src",
+    "README.md"
   ]
 }