feat: add portal support

src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Portal.java

@@ -0,0 +1,46 @@
+package uulm.teamname.marvelous.gamelibrary.entities;
+
+import uulm.teamname.marvelous.gamelibrary.IntVector2;
+
+import java.util.Objects;
+
+/** Represents a portal on the map. */
+public class Portal extends Entity {
+    /**
+     * Constructs a new {@link Portal}.
+     * @param id The {@link EntityID} of the portal
+     * @param position The position of the portal
+     */
+    public Portal(EntityID id, IntVector2 position) {
+        super(id, position);
+        solid = false;
+        opaque = true;
+    }
+
+    @Override
+    public Portal clone() {
+        return new Portal(id, position);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        return super.equals(o);
+    }
+
+
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode());
+    }
+
+
+    @Override
+    public String toString() {
+        return "Portal{" +
+                "position=" + position +
+                '}';
+    }
+}