Add tasks for all the new languages

Task/Maze-generation/Nim/maze-generation.nim

@@ -0,0 +1,37 @@
+import math, sequtils, strutils
+randomize()
+
+template newSeqWith(len: int, init: expr): expr =
+  var result {.gensym.} = newSeq[type(init)](len)
+  for i in 0 .. <len:
+    result[i] = init
+  result
+
+iterator randomCover[T](xs: openarray[T]): T =
+  var js = toSeq 0..xs.high
+  for i in countdown(js.high, 0):
+    let j = random(i + 1)
+    swap(js[i], js[j])
+  for j in js:
+    yield xs[j]
+
+const
+  w = 14
+  h = 10
+
+var
+  vis = newSeqWith(h, newSeq[bool](w))
+  hor = newSeqWith(h+1, newSeqWith(w, "+---"))
+  ver = newSeqWith(h, newSeqWith(w, "|   ") & "|")
+
+proc walk(x, y) =
+  vis[y][x] = true
+  for p in [[x-1,y], [x,y+1], [x+1,y], [x,y-1]].randomCover:
+    if p[0] notin 0 .. <w or p[1] notin 0 .. <h or vis[p[1]][p[0]]: continue
+    if p[0] == x: hor[max(y, p[1])][x] = "+   "
+    if p[1] == y: ver[y][max(x, p[0])] = "    "
+    walk p[0], p[1]
+
+walk random(0..w), random(0..h)
+for a,b in zip(hor, ver & @[""]).items:
+  echo join(a & "+\n" & b)