Add tasks for all the new languages

Task/CSV-data-manipulation/Nim/csv-data-manipulation.nim

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+import strutils, streams
+
+let
+  csv = newFileStream("data.csv", fmRead)
+  outf = newFileStream("data-out.csv", fmWrite)
+
+var lineNumber = 1
+
+while true:
+  if atEnd(csv):
+    break
+  var line = readLine(csv)
+
+  if lineNumber == 1:
+    line.add(",SUM")
+  else:
+    var tmp = 0
+    for n in split(line, ","):
+      tmp += parseInt(n)
+    line.add(",")
+    line.add($tmp)
+
+  outf.writeLn($line)
+
+  inc lineNumber