Add model of publication.

codiki-domain/src/main/java/org/codiki/domain/publication/model/Author.java

@@ -0,0 +1,10 @@
+package org.codiki.domain.publication.model;
+
+import java.util.UUID;
+
+public record Author(
+    UUID id,
+    String name,
+    String image
+) {
+}

codiki-domain/src/main/java/org/codiki/domain/publication/model/Category.java

@@ -0,0 +1,11 @@
+package org.codiki.domain.publication.model;
+
+import java.util.List;
+import java.util.UUID;
+
+public record Category(
+    UUID id,
+    String name,
+    List<Category> subCategories
+) {
+}

codiki-domain/src/main/java/org/codiki/domain/publication/model/Publication.java

@@ -0,0 +1,17 @@
+package org.codiki.domain.publication.model;
+
+import java.time.ZonedDateTime;
+import java.util.UUID;
+
+public record Publication(
+    UUID id,
+    String key,
+    String title,
+    String text,
+    String description,
+    String image,
+    ZonedDateTime creationDate,
+    Author author,
+    Category category
+) {
+}