NCP-3 add usercontent crud's,dto,exception and start restcontroller

src/main/java/ru/soune/no_copy/dto/UserContentDTO.java

@@ -0,0 +1,15 @@
+package ru.soune.no_copy.dto;
+
+import lombok.Data;
+import ru.soune.no_copy.entity.FileType;
+
+@Data
+public class UserContentDTO {
+    String fileName;
+    String originalFilename;
+    String fileType;
+    String fileExtension;
+    Long fileSize;
+    String filePath;
+    Integer protectionLevel;
+}