Add tasks for all the new languages

Task/Optional-parameters/Nim/optional-parameters.nim

@@ -0,0 +1,22 @@
+import algorithm, strutils, future
+
+proc printTable(a) =
+  for row in a:
+    for x in row: stdout.write x, repeatChar(4 - x.len)
+    echo ""
+  echo ""
+
+proc sortTable(a: seq[seq[string]], column = 0, reverse = false,
+    ordering: (proc(a,b: string): int) = system.cmp) : seq[seq[string]] =
+  let order = if reverse: Descending else: Ascending
+  result = a
+  result.sort(proc(x,y:seq[string]):int = ordering(x[column],y[column]), order)
+
+const data = @[@["a", "b", "c"], @["", "q", "z"], @["zap", "zip", "Zot"]]
+
+printTable data
+printTable sortTable(data)
+printTable sortTable(data, column = 2)
+printTable sortTable(data, column = 1)
+printTable sortTable(data, column = 1, reverse = true)
+printTable sortTable(data, ordering = (a,b) => cmp[int](b.len,a.len))