Added new Autokey class for Autokey cipher

Headers/Autokey.hpp

@@ -0,0 +1,27 @@
+//Ciphers/Headers/Autokey.hpp
+//Matthew Ellison
+// Created: 5-2-18
+//Modified: 5-3-18
+//This file contains the declaration of the Autokey class
+//This class will encode a message using the Autokey cipher
+
+#ifndef AUTOKEY_HPP
+#define AUTOKEY_HPP
+
+#include "Vigenere.hpp"
+
+
+class Autokey : public Vigenere{
+protected:
+	virtual void encodeSetKeyword(std::string& key, std::string input);
+	virtual void decodeSetKeyword(std::string& key, std::string input);
+	std::string decode();
+public:
+	Autokey();
+	~Autokey();
+	virtual std::string encode(std::string key, std::string input);
+	virtual std::string decode(std::string key, std::string input);
+};
+
+
+#endif //AUTOKEY_HPP