feat: add email notification and logging features

- Introduce email notification configuration options in the README
- Create a new config.sh file for managing environment variables
- Implement mail.sh for sending email notifications
- Add logging functionality to main.sh for tracking synchronization processes

These changes enhance the functionality of the script by allowing users to receive email notifications about the synchronization status and maintain logs of the operations performed. The new configuration options provide flexibility in managing email settings and improve the overall usability of the tool.

mail.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# 参数获取
+SMTP_SERVER="$1"
+SMTP_PORT="$2"
+SMTP_USER="$3"
+SMTP_PASS="$4"
+MAIL_TO="$5"
+MAIL_FROM="$6"
+SUBJECT="$7"
+BODY="$8"
+
+# 发送邮件
+send_mail() {
+    local email_content="Subject: $SUBJECT
+From: $MAIL_FROM
+To: $MAIL_TO
+Content-Type: text/plain; charset=UTF-8
+Date: $(date -R)
+
+$BODY"
+
+    curl -s --url "smtps://$SMTP_SERVER:$SMTP_PORT" \
+        --mail-from "$MAIL_FROM" \
+        --mail-rcpt "$MAIL_TO" \
+        --upload-file - \
+        --ssl-reqd \
+        --user "$SMTP_USER:$SMTP_PASS" \
+        <<< "$email_content"
+}
+
+# 主函数
+main() {
+    # 验证必要参数
+    if [ -z "$SMTP_SERVER" ] || [ -z "$SMTP_USER" ] || [ -z "$SMTP_PASS" ] || [ -z "$MAIL_TO" ]; then
+        echo "错误: 缺少必要的邮件配置"
+        exit 1
+    fi
+
+    send_mail
+}
+
+main "$@"