add AssassinWeapon and KnightWeapon and WizardWeapon

Java-Knight/src/main/java/org/project/item/weapons/AssassinWeapon.java

@@ -0,0 +1,4 @@
+package org.project.item.weapons;
+
+public class AssassinWeapon {
+}

Java-Knight/src/main/java/org/project/item/weapons/KnightWeapon.java

@@ -0,0 +1,4 @@
+package org.project.item.weapons;
+
+public class KnightWeapon {
+}

Java-Knight/src/main/java/org/project/item/weapons/WizardWeapon.java

@@ -0,0 +1,4 @@
+package org.project.item.weapons;
+
+public class WizardWeapon {
+}