Add support for fetching session data; add /start url

(Noded/frontend#15)

app/controllers/api/v1/Session.controller.js

@@ -0,0 +1,26 @@
+const { Controller } = require('libflitter')
+
+class SessionController extends Controller {
+    static get services() {
+        return [...super.services, 'configs']
+    }
+
+    async get_session(req, res, next) {
+        return res.api(await this.session_data(req.user))
+    }
+
+    async session_data(user) {
+        return {
+            user: {
+                id: user.id,
+                username: user.uid,
+            },
+            app: {
+                name: this.configs.get('app.name'),
+                url: this.configs.get('app.url'),
+            },
+        }
+    }
+}
+
+module.exports = exports = SessionController