Adding a scene manger and wal functions

lib/wal/sources/Scene/Scene.cpp

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+//
+// Created by Zoe Roux on 2021-05-14.
+//
+
+#include "Scene.hpp"

lib/wal/sources/Scene/Scene.hpp

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+//
+// Created by Zoe Roux on 2021-05-14.
+//
+
+
+#pragma once
+
+#include <vector>
+#include "Entity/Entity.hpp"
+
+namespace WAL
+{
+	//! @brief Represent a single scene that contains entities.
+	class Scene
+	{
+	private:
+		//! @brief The list of registered entities
+		std::vector<Entity> _entity;
+	};
+}

lib/wal/sources/Scene/SceneManager.cpp

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+//
+// Created by Zoe Roux on 2021-05-14.
+//
+
+#include "SceneManager.hpp"
+
+namespace WAL
+{
+	SceneManager &WAL::SceneManager::addScene(WAL::Scene &&scene)
+	{
+		this->_scenes.push_front(scene);
+		return *this;
+	}
+
+	SceneManager &SceneManager::addBackScene(Scene &&scene)
+	{
+		this->_scenes.insert(++this->_scenes.begin(), scene);
+		return *this;
+	}
+
+	Scene &SceneManager::getCurrent()
+	{
+		return this->_scenes.front();
+	}
+
+	SceneManager &SceneManager::closeCurrent()
+	{
+		this->_scenes.pop_front();
+		return *this;
+	}
+}

lib/wal/sources/Scene/SceneManager.hpp

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+//
+// Created by Zoe Roux on 2021-05-14.
+//
+
+
+#pragma once
+
+#include <queue>
+#include "Scene/Scene.hpp"
+
+namespace WAL
+{
+	//! @brief A class to manage scenes
+	class SceneManager
+	{
+	private:
+		std::deque<Scene> _scenes = {};
+	public:
+		//! @brief Add a scene to the container and move to it.
+		//! @return The manager instance used to call this function is returned. This allow method chaining.
+		SceneManager &addScene(Scene &&scene);
+
+		//! @brief Add a scene before the current scene to allow
+		//! @return The manager instance used to call this function is returned. This allow method chaining.
+		SceneManager &addBackScene(Scene &&scene);
+
+		//! @breif Get the current scene
+		Scene &getCurrent();
+
+		//! @brief Remove the current scene and switch to the previous scene on the stack.
+		//! @return The manager instance used to call this function is returned. This allow method chaining.
+		SceneManager &closeCurrent();
+
+		//! @brief A default constructor
+		SceneManager() = default;
+		//! @brief A scene manager is copy constructable
+		SceneManager(const SceneManager &) = default;
+		//! @brief A default destructor.
+		~SceneManager() = default;
+		//! @brief A scene manager is assignable
+		SceneManager &operator=(const SceneManager &) = default;
+	};
+}