feat: initialized template and wrote first gameplay code

modules/wave_survival/player_body.h

@@ -0,0 +1,37 @@
+#ifndef PLAYER_BODY_H
+#define PLAYER_BODY_H
+
+#include "scene/3d/physics/character_body_3d.h"
+
+class PlayerBody : public CharacterBody3D {
+	GDCLASS(PlayerBody, CharacterBody3D);
+	static void _bind_methods();
+	static PlayerBody *singleton_instance;
+
+private:
+	void ready();
+	void process(double delta);
+	void physics_process(double delta);
+
+	void set_movement_input(Vector2 state);
+	void on_look_input(Vector2 look);
+	void on_jump_input();
+	void on_run_input(bool run);
+
+protected:
+	void _notification(int what);
+
+public:
+	static PlayerBody *get_singleton();
+	bool get_is_running() const;
+
+private:
+	bool try_running{ false };
+	float walk_speed{ 7.f };
+	float run_speed{ 10.f };
+	float acceleration{ 40.f };
+	float jump_strength{ 3.5f };
+	Vector2 movement_input{};
+};
+
+#endif // !PLAYER_BODY_H