Start CSV importer feature

app/controllers/contestants_controller.rb

@@ -42,6 +42,21 @@ class ContestantsController < ApplicationController
     redirect_to contest_path(@contest)
   end
 
+  def import
+    authorize @contest
+
+    if params[:csv_import]
+      @csv_import = CsvImport.new(params.require(:csv_import).permit(:file, :separator))
+      if @csv_import.save
+        @csv_import = CsvImport.new
+      else
+        render :import, status: :unprocessable_entity
+      end
+    else
+      @csv_import = CsvImport.new
+    end
+  end
+
   private
 
   def set_contest