added Stage Event

src/main/java/org/betonquest/betonquest/quest/event/stage/StageEvent.java

@@ -0,0 +1,39 @@
+package org.betonquest.betonquest.quest.event.stage;
+
+import org.betonquest.betonquest.VariableString;
+import org.betonquest.betonquest.api.profiles.Profile;
+import org.betonquest.betonquest.api.quest.event.Event;
+import org.betonquest.betonquest.exceptions.QuestRuntimeException;
+import org.betonquest.betonquest.objectives.StageObjective;
+
+/**
+ * The StageEvent class to set the players stage.
+ */
+public class StageEvent implements Event {
+    /**
+     * The stage objective.
+     */
+    private final StageObjective stage;
+
+    /**
+     * The target stage to set.
+     */
+    private final VariableString targetStage;
+
+    /**
+     * Creates the stage event.
+     *
+     * @param stage       the stage objective.
+     * @param targetStage the target stage to set.
+     */
+    public StageEvent(final StageObjective stage, final VariableString targetStage) {
+        this.stage = stage;
+        this.targetStage = targetStage;
+    }
+
+    @Override
+    public void execute(final Profile profile) throws QuestRuntimeException {
+        stage.setStage(profile, targetStage.getString(profile));
+    }
+
+}

src/main/java/org/betonquest/betonquest/quest/event/stage/StageEventFactory.java

@@ -0,0 +1,13 @@
+package org.betonquest.betonquest.quest.event.stage;
+
+import org.betonquest.betonquest.Instruction;
+import org.betonquest.betonquest.api.quest.event.Event;
+import org.betonquest.betonquest.api.quest.event.EventFactory;
+import org.betonquest.betonquest.exceptions.InstructionParseException;
+
+public class StageEventFactory implements EventFactory {
+    @Override
+    public Event parseEvent(final Instruction instruction) throws InstructionParseException {
+        return null;
+    }
+}

src/main/java/org/betonquest/betonquest/quest/event/stage/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * {@link org.betonquest.betonquest.api.quest.event.Event Event} implementation of the stage event.
+ */
+package org.betonquest.betonquest.quest.event.stage;