Added propper error handling

Headers/Playfair.hpp

@@ -14,6 +14,23 @@
 
 class Playfair{
 private:
+	//Classed to help with error handling
+	class letterNotFound{
+		private:
+		char letter;
+		public:
+		letterNotFound(char letter): letter(letter)	{}
+		char getLetter(){	return letter;	}
+	};
+	class invalidGrid{
+		private:
+		std::string type;
+		unsigned int size;
+		public:
+		invalidGrid(std::string type, unsigned int size): type(type), size(size)	{}
+		std::string getType(){	return type;	}
+		int getSize(){	return size;	}
+	};
 	static char REPLACED;	//The letter that will need to be replaced in the grid and any input string or keyword
 	static char REPLACER;	//The letter that replaced REPLACED in any input string or keyword
 	static char DOUBLED;	//The letter that will be placed between double letters in the input string if necessary or to make the string length even