Add Music fluctuations project and Chinese plan docs

MVS/Music fluctuations/source/scene/SceneManager.cpp

@@ -0,0 +1,37 @@
+#include"SceneManager.h"
+#include"Scene.h"
+
+SceneManager::SceneManager(){}
+
+SceneManager::~SceneManager(){}
+
+void SceneManager::ChangeScene(Scene* p_nextScene)
+{
+	if (p_nextScene == nullptr) { return; }
+	if (m_currentScene != nullptr)
+	{
+		p_nextScene->m_context = m_currentScene->m_context;
+		m_currentScene->OnExit();
+	}
+	p_nextScene->OnEnter();
+	m_currentScene = p_nextScene;
+}
+
+void SceneManager::ChangeScene(std::string p_name)
+{
+	if (Scene* scene = GetScene(p_name); scene)
+		ChangeScene(scene);
+}
+
+void SceneManager::RegisterScene(std::string p_name, Scene* p_scene)
+{
+	if (m_scenes.find(p_name) == m_scenes.end())
+		m_scenes[p_name] = p_scene;
+}
+
+Scene* SceneManager::GetScene(std::string p_name)
+{
+	if (m_scenes.find(p_name) != m_scenes.end())
+		return m_scenes[p_name];
+	return NULL;
+}