Add tasks for all the new languages

Task/Loops-Nested/Nim/loops-nested.nim

@@ -0,0 +1,24 @@
+import math, strutils
+
+const arrSize = 10
+
+var a: array[0..arrSize-1, array[0..arrSize-1, int]]
+var s: string = ""
+
+randomize()   # different results each time this runs
+
+for i in 0 .. arrSize-1:
+   for j in countup(0,arrSize-1):
+      a[i][j] = random(20)+1
+
+block outer:
+   for i in countup(0,arrSize-1):
+      for j in 0 .. arrSize-1:
+         if a[i][j] < 10:
+            s.add(" ")
+         addf(s,"$#",$a[i][j])
+         if a[i][j] == 20:
+            break outer
+         s.add(", ")
+      s.add("\n")
+echo(s)