diff --git a/src/controllers/clients.js b/src/controllers/clients.js
new file mode 100644
index 0000000..26270bc
--- /dev/null
+++ b/src/controllers/clients.js
@@ -0,0 +1,18 @@
+(function () {
+  'use strict';
+  const _ = require('lodash');
+  const clients = [];
+
+  exports.clients = clients;
+
+  exports.add = (client) => {
+    // TODO check id that client is already there
+    if(!_.find(clients, ({id: client.id}))) {
+      clients.push(client);
+    }
+  }
+
+  exports.remove = (client) => {
+    _.remove(clients, {id: client.id});
+  }
+})();
\ No newline at end of file