Adding POJOs. Closes #2.

src/main/java/sk/jusska/sfgpetclinic/model/Owner.java

+package sk.jusska.sfgpetclinic.model;
+
+import sk.jusska.sfgpetclinic.model.Person;
+
+public class Owner extends Person {
+
+}

src/main/java/sk/jusska/sfgpetclinic/model/Person.java

+package sk.jusska.sfgpetclinic.model;
+
+import lombok.Data;
+
+@Data
+public class Person {
+
+    private String firstName;
+    private String lastName;
+
+}

src/main/java/sk/jusska/sfgpetclinic/model/Pet.java

+package sk.jusska.sfgpetclinic.model;
+
+import java.time.LocalDate;
+import lombok.Data;
+
+@Data
+public class Pet {
+
+    private PetType petType;
+    private Owner owner;
+    private LocalDate birthDay;
+
+
+}

src/main/java/sk/jusska/sfgpetclinic/model/PetType.java

+package sk.jusska.sfgpetclinic.model;
+
+import lombok.Data;
+
+@Data
+public class PetType {
+
+    private String name;
+}

src/main/java/sk/jusska/sfgpetclinic/model/Vet.java

+package sk.jusska.sfgpetclinic.model;
+
+public class Vet extends Person {
+
+
+}