Add tasks for all the new languages

Task/Visualize-a-tree/Nim/visualize-a-tree.nim

@@ -0,0 +1,25 @@
+import strutils
+
+type
+  Node[T] = ref TNode[T]
+  TNode[T] = object
+    data: T
+    left, right: Node[T]
+
+proc n[T](data: T; left, right: Node[T] = nil): Node[T] =
+  Node[T](data: data, left: left, right: right)
+
+proc indent[T](n: Node[T]): seq[string] =
+  if n == nil: return @["-- (null)"]
+
+  result = @["--" & $n.data]
+
+  for a in indent n.left: result.add "  |" & a
+
+  let r = indent n.right
+  result.add "  `" & r[0]
+  for a in r[1..r.high]: result.add "   " & a
+
+let tree = 1.n(2.n(4.n(7.n),5.n),3.n(6.n(8.n,9.n)))
+
+echo tree.indent.join("\n")