Add tasks for all the new languages

Task/Odd-word-problem/Nim/odd-word-problem.nim

@@ -0,0 +1,28 @@
+import os, unicode, future
+
+proc nothing(): bool{.closure.} = false
+
+proc odd(prev = nothing): bool =
+  let a = stdin.readChar()
+  if not isAlpha(Rune(ord(a))):
+    discard prev()
+    stdout.write(a)
+    return a != '.'
+
+  # delay action until later, in the shape of a closure
+  proc clos(): bool =
+    stdout.write(a)
+    prev()
+
+  return odd(clos)
+
+proc even(): bool =
+  while true:
+    let c = stdin.readChar()
+    stdout.write(c)
+    if not isAlpha(Rune(ord(c))):
+      return c != '.'
+
+var e = false
+while (if e: odd() else: even()):
+  e = not e