Added example to show how to use system dialogs

templates/_folder_Examples/system dialogs/main.cpp

+#include "AnimationWindow.h"
+#include <iostream>
+
+int main()
+{
+	TDT4102::AnimationWindow window;
+	
+	// Message box
+	window.show_message("test title", "Message", TDT4102::MessageType::INFO);
+	window.show_message("test title", "Message", TDT4102::MessageType::ERROR);
+	window.show_message("test title", "Message", TDT4102::MessageType::QUESTION);
+	window.show_message("test title", "Message", TDT4102::MessageType::WARNING);
+
+	// Yes no question dialog
+    bool result = window.show_yesno_dialog("test title", "message question", TDT4102::MessageType::QUESTION);
+	result = window.show_yesno_dialog("test title", "message question", TDT4102::MessageType::ERROR);
+	result = window.show_yesno_dialog("test title", "message question", TDT4102::MessageType::INFO);
+	result = window.show_yesno_dialog("test title", "message question", TDT4102::MessageType::WARNING);
+
+	if(result == true) {
+		std::cout << "You answered yes" << std::endl;
+	} else {
+		std::cout << "You answered no" << std::endl;
+	}
+
+	// System notifications
+    window.show_notification("test notification", "test notification message", TDT4102::MessageType::INFO);
+	window.show_notification("test notification", "test notification message", TDT4102::MessageType::ERROR);
+	window.show_notification("test notification", "test notification message", TDT4102::MessageType::WARNING);
+	window.show_notification("test notification", "test notification message", TDT4102::MessageType::QUESTION);
+
+	// File open and saving dialogs
+    std::filesystem::path fileToOpen = window.show_open_file_dialog("File to open");
+    std::filesystem::path directoryToOpen = window.show_select_directory_dialog("Directory to open");
+    std::filesystem::path fileToSave = window.show_save_file_dialog("File to save");
+
+	window.wait_for_close();
+	return 0;
+}
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