start backend

src/main/java/com/krylov/refound/enums/ErrorCode.java

@@ -1,4 +1,8 @@
 package com.krylov.refound.enums;
 
 public enum ErrorCode {
+  VALIDATION_ERROR,
+  NOT_FOUND,
+  INTERNAL_ERROR,
+  BAD_REQUEST
 }

src/main/java/com/krylov/refound/enums/PostStatus.java

@@ -1,4 +1,6 @@
 package com.krylov.refound.enums;
 
 public enum PostStatus {
+  ACTIVE,
+  CLOSED
 }

src/main/java/com/krylov/refound/enums/PostType.java

@@ -1,4 +1,6 @@
 package com.krylov.refound.enums;
 
 public enum PostType {
+  LOST,
+  FOUND
 }