Add tasks for all the new languages

Task/Generate-lower-case-ASCII-alphabet/Nim/generate-lower-case-ascii-alphabet.nim

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+# A slice just contains the first and last value
+let alpha: Slice[char] = 'a'..'z'
+echo alpha # (a: a, b: z)
+
+# but can be used to check if a character is in it:
+echo 'f' in alpha # true
+echo 'G' in alpha # false
+
+# A set contains all elements as a bitvector:
+let alphaSet: set[char] = {'a'..'z'}
+echo alphaSet # {a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z}
+echo 'f' in alphaSet # true
+var someChars = {'a','f','g'}
+echo someChars <= alphaSet # true
+
+import sequtils
+# A sequence:
+let alphaSeq = toSeq 'a'..'z'
+echo alphaSeq # @[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]
+echo alphaSeq[10] # k