Add cat utility

cat.nim

@@ -0,0 +1,10 @@
+import cligen, os, streams
+import common
+
+proc main(files:seq[string]) =
+    for file in files:
+        var s = newFileStream(file, fmRead)
+        while not s.atEnd:
+            write(stdout, s.readChar)
+
+dispatch(main)

nimbase.nimble

@@ -7,6 +7,6 @@ license       = "Unlicense"
 requires      "nim >= 0.19.0"
 requires      "cligen >= 0.9.19"
 
-bin           = @["add", "echo", "factor", "false", "mul", "seq", "sleep", "sub", "true", "yes"]
+bin           = @["add", "cat", "echo", "factor", "false", "mul", "seq", "sleep", "sub", "true", "yes"]
 
 binDir        = "bin"