Added classes for Encryption and Decryption

Decryption.h

@@ -0,0 +1,23 @@
+#ifndef DECRYPTION_H
+#define DECRYPTION_H
+
+#include <fstream>
+#include <string>
+
+class Decryption
+{
+public:
+
+	Decryption();
+
+	void setMessage(const std::string);
+	void decryptMessage();
+
+	std::string getMessage() const;	
+
+private:
+	std::fstream readFromFile;
+	std::string message;
+};
+
+#endif