Created GUI (markdown)

GUI.md

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+To be done, here's a quick LUA script with GUI stuff though:
+
+```lua
+----------------------------------------------------------------------------------
+-------------------------------- Artemis LUA file --------------------------------
+----------------------------------------------------------------------------------
+
+local window = Gui.CreateWindow("Test", 1270, 720);
+
+-- Textbox
+local textBox = window.CreateTextBox("", 5, 5, 200, 25);
+local textBoxLabel = window.CreateLabel("Type something in the textbox", 210, 5);
+
+function textChangedHandler(textBox)
+	textBoxLabel.Text = "You typed: " .. textBox.Text;	
+end
+textBox.TextChanged.add(textChangedHandler);
+
+-- Button
+local button = window.CreateButton("Press me :D", 5, 45, 200, 25);
+local buttonLabel = window.CreateLabel("Press the button", 210, 43);
+local pressCount = 1;
+function buttonClickHandler(button)
+	buttonLabel.Text = "You pressed " .. pressCount .. " time(s)";
+	pressCount = pressCount + 1;
+end
+button.Click.add(buttonClickHandler);
+
+-- ComboBox
+local comboBox = window.CreateComboBox("Value 2", {"Value 1", "Value 2", "Value 3"}, 5, 85, 200, 25);
+local comboBoxLabel = window.CreateLabel("Select a value", 210, 83);
+function selectionChangedHandler(comboBox)
+	comboBoxLabel.Text = "You selected: " .. comboBox.Value;
+end
+comboBox.SelectionChanged.add(selectionChangedHandler);
+
+-- CheckBox
+local checkBox = window.CreateCheckBox("Checkbox label", true, 5, 125)
+local checkBoxLabel = window.CreateLabel("Uncheck the checkbox", 210, 120);
+function checkBoxClickHandler(checkBox)
+	if checkBox.IsChecked then
+		checkBoxLabel.Text = "Checkbox is checked";
+	else
+		checkBoxLabel.Text = "Checkbox is not checked";
+	end
+end
+checkBox.Click.add(checkBoxClickHandler);
+```