test: BDD / acceptance tests

Implement acceptance testing using codeceptjs and puppeteer.

test/acceptance/steps_file.js

@@ -0,0 +1,11 @@
+
+// in this file you can append custom step methods to 'I' object
+
+module.exports = function() {
+  return actor({
+
+    // Define custom steps here, use 'this' to access default methods of I.
+    // It is recommended to place a general 'login' function here.
+
+  });
+}