Added abstract State class.

Author: swa-ds

src/main/java/de/doubleslash/kata/designpattern/state/State.java

@@ -0,0 +1,35 @@
+package de.doubleslash.kata.designpattern.state;
+
+public abstract class State {
+
+    protected String stateName;
+
+    public State turnOn() {
+        return this;
+    }
+
+    public State turnOff() {
+        return this;
+    }
+
+    public State wash() {
+        return this;
+    }
+
+    public State openDoor() {
+        return this;
+    }
+
+    public State closeDoor() {
+        return this;
+    }
+
+    public String getStateName() {
+        return stateName;
+    }
+
+    public String toString() {
+        return getStateName();
+    }
+
+}