Add tasks for all the new languages

Task/Matrix-transposition/Nim/matrix-transposition-1.nim

@@ -0,0 +1,13 @@
+proc transpose[X, Y; T](s: array[Y, array[X, T]]): array[X, array[Y, T]] =
+  for i in low(X)..high(X):
+    for j in low(Y)..high(Y):
+      result[i][j] = s[j][i]
+
+let b = [[ 0, 1, 2, 3, 4],
+         [ 5, 6, 7, 8, 9],
+         [ 1, 0, 0, 0,42]]
+let c = transpose(b)
+for r in c:
+  for i in r:
+    stdout.write i, " "
+  echo ""

Task/Matrix-transposition/Nim/matrix-transposition-2.nim

@@ -0,0 +1,11 @@
+proc transpose[T](s: seq[seq[T]]): seq[seq[T]] =
+  result = newSeq[seq[T]](s[0].len)
+  for i in 0 .. < s[0].len:
+    result[i] = newSeq[T](s.len)
+    for j in 0 .. < s.len:
+      result[i][j] = s[j][i]
+
+let a = @[@[ 0, 1, 2, 3, 4],
+          @[ 5, 6, 7, 8, 9],
+          @[ 1, 0, 0, 0,42]]
+echo transpose(a)