Created the client program's framework

There are six scenes here, each of which representing roughly one part of
the final program's backbone.

client/main_menu.cpp

@@ -0,0 +1,69 @@
+#include "main_menu.hpp"
+
+#include <iostream>
+
+using namespace std;
+
+//-------------------------
+//Public access members
+//-------------------------
+
+MainMenu::MainMenu() {
+#ifdef DEBUG
+	cout << "entering MainMenu" << endl;
+#endif
+}
+
+MainMenu::~MainMenu() {
+#ifdef DEBUG
+	cout << "leaving MainMenu" << endl;
+#endif
+}
+
+//-------------------------
+//Frame loop
+//-------------------------
+
+void MainMenu::FrameStart() {
+	//
+}
+
+void MainMenu::Update(double delta) {
+	//
+}
+
+void MainMenu::FrameEnd() {
+	//
+}
+
+void MainMenu::Render(SDL_Surface* const screen) {
+	//
+}
+
+//-------------------------
+//Event handlers
+//-------------------------
+
+void MainMenu::MouseMotion(SDL_MouseMotionEvent const& motion) {
+	//
+}
+
+void MainMenu::MouseButtonDown(SDL_MouseButtonEvent const& button) {
+	//
+}
+
+void MainMenu::MouseButtonUp(SDL_MouseButtonEvent const& button) {
+	//
+}
+
+void MainMenu::KeyDown(SDL_KeyboardEvent const& key) {
+	switch(key.keysym.sym) {
+		case SDLK_ESCAPE:
+			QuitEvent();
+			break;
+	}
+}
+
+void MainMenu::KeyUp(SDL_KeyboardEvent const& key) {
+	//
+}