Implement enemy classes

Java-Knight/src/main/java/org/project/Help.java

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+package org.project;
+
+public class Help {
+}

Java-Knight/src/main/java/org/project/entity/enemies/Dragon.java

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+package org.project.entity.enemies;
+
+public class Dragon {
+}

Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java

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+package org.project.entity.enemies;
+
+public class Goblin {
+}

Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java

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+package org.project.entity.enemies;
+
+public class Vampire {
+}

Java-Knight/src/main/java/org/project/entity/players/Assassin.java

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+package org.project.entity.players;
+
+public class Assassin {
+}

Java-Knight/src/main/java/org/project/entity/players/Wizard.java

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+package org.project.entity.players;
+
+public class Wizard {
+}