added statistics for create and found posts

src/main/java/com/krylov/refound/entity/Statistics.java

@@ -0,0 +1,20 @@
+package com.krylov.refound.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import lombok.Getter;
+import lombok.Setter;
+
+@Entity
+@Table(name = "statistics")
+@Getter
+@Setter
+public class Statistics {
+  @Id
+  private Long id;
+
+  private Long postsCreated;
+
+  private Long postsFound;
+}