show onboarding page when currency is not set

app/controllers/original_gangstas_controller.rb

@@ -0,0 +1,28 @@
+class OriginalGangstasController < ApplicationController
+  def show
+    if OriginalGangsta.count.zero?
+      OriginalGangsta.create.save
+    end
+
+    json_response OriginalGangsta.first
+  end
+
+  def update
+    if original_gangsta_params[:chip_scale].to_i.positive?
+      OriginalGangsta.update(original_gangsta_params)
+      json_response onboarded: true
+    else
+      error_response :bad_request
+    end
+  end
+
+  private
+
+  def original_gangsta_params
+    params.require(:original_gangsta).permit :chip_name,
+                                             :chip_code,
+                                             :chip_symbol,
+                                             :chip_scale,
+                                             :chip_prefixed
+  end
+end