feat: created user entity

src/main/java/com/application/munera/data/User.java

@@ -0,0 +1,41 @@
+package com.application.munera.data;
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.Size;
+import lombok.Data;
+
+@Entity
+@Data
+@Table(name = "users")
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "Id", unique = true, nullable = false)
+    private Long id;
+
+    @Size(max = 100)
+    @Column(name = "FirstName", nullable = false)
+    private String firstName;
+
+    @Size(max = 100)
+    @Column(name = "LastName", nullable = false)
+    private String lastName;
+
+    @Size(max = 100)
+    @Column(name = "username", nullable = false)
+    private String username;
+
+    @Size(max = 100)
+    @Column(name = "password", nullable = false)
+    private String password;
+
+    @Column(name = "roles", nullable = false)
+    private String roles;
+
+    @Email
+    @Size(max = 100)
+    @Column(name = "email")
+    private String email;
+}

src/main/java/com/application/munera/repositories/UserRepository.java

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+package com.application.munera.repositories;
+
+import com.application.munera.data.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+
+    User findByUsername(final String username);
+}