add user scaffold

spec/requests/users_spec.rb

@@ -0,0 +1,17 @@
+require 'rails_helper'
+
+RSpec.describe "/users", type: :request do
+  let(:valid_attributes) {
+    {
+      username: 'geonizeli'
+    }
+  }
+
+  describe "GET /show" do
+    it "renders a successful response" do
+      user = User.create! valid_attributes
+      get user_url(user), as: :json
+      expect(response).to be_successful
+    end
+  end
+end