Added a missing file

lib/posix/h2-io-file-get_default_option.adb

@@ -0,0 +1,13 @@
+separate (H2.IO.File)
+
+function Get_Default_Option return Option_Record is
+
+	Default_Option: constant Option_Record := (
+		Bits => OPTION_CRLF_IN,
+		CR => Ascii.Code.CR,
+		LF => Ascii.Code.LF
+	);
+
+begin
+	return Default_Option;
+end Get_Default_Option;