docs: Added some commentaries to code

Signed-off-by: Proxyfil <piloupilou200@gmail.com>

Author: Proxyfil

topics/tic-tac-toe/src/game/game.rs

@@ -20,6 +20,7 @@ impl Game {
         }
     }
 
+    // Main game loop
     pub fn play(&mut self) {
         loop {
             self.display_board();

topics/tic-tac-toe/src/main.rs

@@ -2,6 +2,7 @@ mod game;
 
 use crate::game::game::Game;
 
+// Main game entry point
 fn main() {
     println!("Starting Tic Tac Toe game..." );
     let mut game = Game::new();