BAEL-614 base module for cache-control

spring-security-cache-control/src/main/java/com/baeldung/cachecontrol/model/TimestampDto.java

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+package com.baeldung.cachecontrol.model;
+
+
+public class TimestampDto {
+    public final Long timestamp;
+
+    public TimestampDto(Long timestamp) {
+        this.timestamp = timestamp;
+    }
+}

spring-security-cache-control/src/main/java/com/baeldung/cachecontrol/model/UserDto.java

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+package com.baeldung.cachecontrol.model;
+
+
+public class UserDto {
+    public final String name;
+
+    public UserDto(String name) {
+        this.name = name;
+    }
+
+}