feat: implemented EntitySerializer and partial test

src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java

@@ -0,0 +1,43 @@
+package uulm.teamname.marvelous.gamelibrary.json.ingame.serialize;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+import uulm.teamname.marvelous.gamelibrary.IntVector2;
+import uulm.teamname.marvelous.gamelibrary.entities.Character;
+import uulm.teamname.marvelous.gamelibrary.entities.EntityID;
+import uulm.teamname.marvelous.gamelibrary.entities.EntityType;
+import uulm.teamname.marvelous.gamelibrary.entities.StoneType;
+import uulm.teamname.marvelous.gamelibrary.json.ingame.deserialize.EntityDeserializer;
+
+import static org.mockito.Mockito.*;
+import static org.junit.jupiter.api.Assertions.*;
+
+class EntitySerializerTest {
+
+
+    @Test
+    void notATestJustSomethingToRun() throws JsonProcessingException {
+        var mapper = new ObjectMapper();
+
+        var chara = new Character(
+                new EntityID(EntityType.P2, 3),
+                new IntVector2(12, 24),
+                "CoolHeroThing",
+                200,
+                300,
+                400,
+                500,
+                600,
+                700);
+
+        chara.inventory.addStone(StoneType.SoulStone);
+        chara.inventory.addStone(StoneType.SpaceStone);
+        chara.inventory.addStone(StoneType.MindStone);
+
+        var result = mapper.writeValueAsString(chara);
+
+        System.out.println(result);
+    }
+
+}