Ajouter les contraintes sur scheduler, impl canal,

ajout les methode concrete MI

src/impl/Scheduler.java

@@ -0,0 +1,16 @@
+package impl;
+
+import java.util.concurrent.*;
+
+public class Scheduler {
+    private final ScheduledExecutorService scheduler;
+
+    public Scheduler(int nbCanaux) {
+        int nThread = 2+2*nbCanaux;
+        scheduler = Executors.newScheduledThreadPool(nThread);
+    }
+
+    public <T> Future<T> enquete(Callable<T> task, long delay) {
+        return scheduler.schedule(task, delay, TimeUnit.MICROSECONDS);
+    }
+}