Add tasks for all the new languages

Task/Rep-string/Nim/rep-string.nim

@@ -0,0 +1,22 @@
+import strutils
+
+proc isRepeated(text): int =
+  for x in countdown(text.len div 2, 0):
+    if text.startsWith(text[x..text.high]): return x
+
+const matchstr = """1001110011
+1110111011
+0010010010
+1010101010
+1111111111
+0100101101
+0100100
+101
+11
+00
+1"""
+
+for line in matchstr.split():
+  let ln = isRepeated(line)
+  echo "'", line, "' has a repetition length of ", ln, " i.e ",
+    (if ln > 0: "'" & line[0 .. <ln] & "'" else: "*not* a rep-string")