Update TODO with example response from account server.

TODO.md

@@ -1,7 +1,9 @@
 #TODO
-Features that still need to be added or are nice to have.
+##Features that still need to be added or are nice to have.
 
 * Use GWID and GWKEY to fetch the gateway's configuration from the TTN account server. The result should contain a link to the correct global_conf.json for the gateway's region. Also the antenna gain, router address, location. Use these to write an appropriate local_conf.json.
+  GET https://account.thethingsnetwork.org/gateways/<gw-id>
+  Authorization: Key ttn-account-v2.######
 
 * Add ability to enable/disable TTN by environment variable. Default enabled.
 
@@ -10,3 +12,34 @@ Features that still need to be added or are nice to have.
   * Server hostname/ip (default log.gatewaystats.org)
   * server port (default 1700)
   * downlink enabled (default off)
+
+##JSON response from TTN account server
+```javascript
+{
+  "id": "jpm-test",
+  "frequency_plan": "EU_863_870",
+  "frequency_plan_url": "https://account.thethingsnetwork.org/api/v2/frequency-plans/EU_863_870",
+  "public_rights": [],
+  "location_public": false,
+  "status_public": false,
+  "owner_public": false,
+  "attributes": {
+    "description": "jp's test gateway",
+    "placement": "indoor"
+  },
+  "router": "router.dev.thethings.network:1883",
+  "location": null,
+  "owner": {
+    "id": "######",
+    "username": "jpmeijers"
+  },
+  "key": "ttn-account-v2.######",
+  "auto_update": true,
+  "activated": false,
+  "firmware_url": "http://ttnreleases.blob.core.windows.net/the-things-gateway/v1",
+  "token": {
+    "expires_in": 8035200,
+    "access_token": "######"
+  }
+}
+```