add basic timer

include/client/state/GameState.h

@@ -12,6 +12,7 @@ class GameState : public ClientState {
 	game::WorldPtr m_World;
 	sim::ClientSimulation m_Simulation;
 	float m_CurrentLerp;
+	float m_ElapsedTime;
 
   public:
 	GameState(Client& a_Client, const game::WorldPtr& a_World, std::uint64_t a_StepTime, const std::vector<protocol::LockStep> a_FirstSteps);
@@ -23,6 +24,10 @@ class GameState : public ClientState {
 		return m_CurrentLerp;
 	}
 
+	float GetElapsedTime() const {
+		return m_ElapsedTime;
+	}
+
 	game::WorldPtr GetWorld() const {
 		return m_World;
 	}

include/td/render/renderer/TimerRenderer.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "client/state/GameState.h"
+#include <td/render/Renderer.h>
+#include <client/PlayerManager.h>
+
+namespace td {
+namespace render {
+
+class TimerRenderer : public BasicRenderer {
+  private:
+	const client::GameState& m_State;
+  public:
+	virtual void Render(float a_Lerp) override;
+
+	TimerRenderer(const client::GameState& a_State);
+	~TimerRenderer() {}
+};
+
+}  // namespace render
+}  // namespace td