Add tasks for all the new languages

Task/Anagrams/Nim/anagrams.nim

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+import tables, strutils, algorithm
+
+proc main() =
+    var
+        count    = 0
+        anagrams = initTable[string, seq[string]]()
+
+    for word in "unixdict.txt".lines():
+        var key = word
+        key.sort(cmp[char])
+        anagrams.mgetOrPut(key, newSeq[string]()).add(word)
+        count = max(count, anagrams[key].len)
+
+    for k, v in anagrams:
+        if v.len == count:
+            v.join(", ").echo
+
+main()