Add CsvService and FileService, and ImportService/Title (#21)

app/service/csv_service.rb

@@ -0,0 +1,10 @@
+require 'csv'
+
+class CsvService
+  attr_accessor :filepath, :csv_table
+
+  def initialize(filepath)
+    @filepath = filepath
+    @csv_table = CSV.read(filepath, headers: true)
+  end
+end

app/service/file_service.rb

@@ -0,0 +1,5 @@
+class FileService
+  def initialize
+    # TODO: 書く
+  end
+end

app/service/import_service/title.rb

@@ -0,0 +1,20 @@
+module ImportService
+  class Title
+    def execute
+      ActiveRecord::Base.transaction do
+        ::Title.import(columns, values, validate: true)
+      end
+    end
+
+    def columns
+      [:name]
+    end
+
+    def values
+      [
+        ['abc'],
+        ['def'],
+      ]
+    end
+  end
+end