Add testbench for top_ultrasonic_led module

- Created a new testbench file `top_ultrasonic_led_tb.vvp` to simulate the `top_ultrasonic_led` module.
- Defined the necessary signals and events for testing the ultrasonic sensor functionality.
- Implemented the main test sequence including triggering the ultrasonic sensor and monitoring the output LEDs based on distance measurements.
- Included timing and state management for accurate simulation of the ultrasonic sensor behavior.

Semaine 1/Capteur_recule/top_ultrasonic_led.v

@@ -0,0 +1,28 @@
+module top_ultrasonic_led (
+    input wire clk,
+    input wire rst,
+    input wire start,       // bouton ou signal de départ
+    input wire echo,        // signal du capteur
+    output wire trig,       // vers le capteur
+    output wire [5:0] leds  // sorties LED
+);
+
+    wire [8:0] distance;
+
+    // Module de mesure de distance
+    ultrasonic_fpga ultrasonic_inst (
+        .clk(clk),
+        .rst(rst),
+        .start(start),
+        .echo(echo),
+        .trig_out(trig),
+        .distance(distance)
+    );
+
+    // Module d'affichage leds
+    distance_display_led led_display_inst (
+        .distance(distance),
+        .leds(leds)
+    );
+    
+endmodule