implement server and client player join/leave notifications

include/blitz/components/PlayerInfo.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <blitz/common/Types.h>
+#include <string>
+
+namespace blitz {
+
+struct PlayerInfoComponent {
+	EntityID m_PlayerId;
+	std::string m_Pseudo;
+};
+
+}  // namespace blitz