feat: update mail template (#62)

build.gradle

@@ -35,6 +35,7 @@ subprojects {
         hikariVersion = '5.0.0'
         jacksonVersion = '2.13.1'
         easyExcelVersion = '3.0.5'
+        freemarkerVersion = '2.3.31'
     }
 
     dependencies {
@@ -49,6 +50,7 @@ subprojects {
 
         implementation "org.slf4j:slf4j-api:${slf4jVersion}"
         implementation "com.alibaba:easyexcel:${easyExcelVersion}"
+        implementation "org.freemarker:freemarker:${freemarkerVersion}"
 
     }