Initial data commit

Task/Bitmap-Read-an-image-through-a-pipe/Nim/bitmap-read-an-image-through-a-pipe.nim

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+import bitmap
+import osproc
+import ppm_read
+import streams
+
+# Launch Netpbm "jpegtopnm".
+# Input is taken from "input.jpeg" and result sent to stdout.
+let p = startProcess("jpegtopnm", args = ["input.jpeg"], options = {poUsePath})
+let stream = FileStream(p.outputStream())
+let image = stream.readPPM()
+echo image.w, " ", image.h
+p.close()