プロジェクトの環境設定ファイルを追加し、README.mdに開発セットアップ手順を追記。作業ログ用のdiary.mdを新規作成し、.gitignoreを更新して不要なファイルを除外。サンプルデータCSVファイルを追加。

Sample-data/IDEMITSU_2512-2.csv

@@ -0,0 +1,9 @@
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+<EFBFBD><EFBFBD><EFBFBD>x<EFBFBD><EFBFBD><EFBFBD><EFBFBD>,2025/12/08
+<EFBFBD><EFBFBD><EFBFBD>񂲐<EFBFBD><EFBFBD><EFBFBD><EFBFBD>z,0000004690
+
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