added get and create post

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

@@ -1,6 +1,13 @@
 package com.krylov.refound.enums;
 
+import com.fasterxml.jackson.annotation.JsonCreator;
+
 public enum PostType {
-  LOST,
-  FOUND
+  LOSS,
+  FOUND;
+
+  @JsonCreator
+  public static PostType from(String value) {
+    return PostType.valueOf(value.toUpperCase());
+  }
 }