Add simple solution to dining philosophers

src/main/scala/lecture6/05-DiningPhilosophers.scala

+package lecture6
+
+class Fork(var index: Int)
+
+def philosopherTurn(i: Int, l: Fork, r: Fork): Unit =
+  Thread.sleep(10)
+
+  var (left, right) =
+    if i % 2 == 0 then (l, r) else (r, l)
+    // if l.index < r.index then (l, r) else (r, l)
+
+  left.synchronized {
+    log(f"Philosopher $i picks up left fork ${left.index}")
+    right.synchronized {
+      log(f"Philosopher $i picks up right fork ${right.index} - eating")
+      Thread.sleep(100)
+      log(f"Philosopher $i puts down right fork ${right.index}")
+    }
+    log(f"Philosopher $i puts down left fork ${left.index}")
+  }
+
+@main def run() =
+  val n = 5
+  val k: Int = 3
+  val forks = new Array[Fork](n)
+  val philosophers = new Array[Thread](n)
+  for p <- 0 to n - 1 do
+    forks(p) = Fork(p)
+
+  for p <- 0 to n - 1 do
+    philosophers(p) = new Thread:
+      override def run() =
+        for _ <- 0 until k do
+          philosopherTurn(p, forks(p % n), forks((p + 1) % n))
+    philosophers(p).start
+
+  for p <- 0 to n - 1 do
+    philosophers(p).join()