added bridge sample

bridge/src/main/java/com/iluwatar/MagicWeapon.java

@@ -0,0 +1,21 @@
+package com.iluwatar;
+
+public abstract class MagicWeapon {
+
+	protected MagicWeaponImp imp;
+	
+	public MagicWeapon(MagicWeaponImp imp) {
+		this.imp = imp;
+	}
+	
+	public abstract void wield();
+	
+	public abstract void swing();
+	
+	public abstract void unwield();
+	
+	public MagicWeaponImp getImp() {
+		return imp;
+	}
+	
+}