Add ability to build defaults.ini format

README.md

@@ -67,7 +67,7 @@ handles both of the ways of handling newlines in values that nvram_dump does,
 so you can send any nvram_dump output back through nvram_build to recreate the
 backup. The command looks like:
 ```
-nvram_build [-o output_filename] filename...
+nvram_build [-o output_filename] [-d] filename...
 ```
 with one or more input files listed on the command line. If you don't use the
 -o switch the program takes the first input filename and replaces any
@@ -77,6 +77,9 @@ be output. It keeps any path you used, so the output will end up in the same
 directory as the first input file. You can use the -o switch to override this
 and specify a filename for the resulting backup file.
 
+As with nvram_dump, the -d switch causes the program to output a file in the
+format used by the defaults.ini file.
+
 Diagnostic messages are written to the standard error stream. The program
 exits with a 0 exit code if everything went well and 1 if an error occurred.