Add new USAGE page

README.md

@@ -4,7 +4,7 @@ Takes any file, and outputs a "paper backup": a printable black-and-white pdf fu
 
 Following the directions in the pdf, the QR codes can be re-scanned or photographed using a webcam to restore the original file.
 
-For a full list of options, run `qr-backup --help`. For more questions, see the [FAQ](FAQ.md).
+For a full list of options, run `qr-backup --help` or read the [USAGE](usage.md) doc online. For more questions, see the [FAQ](FAQ.md).
 
 This is alpha software--I use it for my own backups, but I offer no guarantees. Test your restore when you make it, not when you need it!
 

USAGE.md

@@ -0,0 +1,31 @@
+Output of `qr-backup --help`:
+
+```
+Usage: qr-codes.py [OPTIONS] FILE
+Convert a binary file to a paper .pdf backup of QR codes.
+
+The QR codes can be read back with a scanner or webcam to re-create the original file. Directions are included in the PDF. Make sure to test that you can actually read the QR size you select.
+
+    --dpi DPI
+        Sets the print resolution of your printer. Default: 600
+    --compress, --no-compress
+        This gives a more compact backup, but partial recovery is impossible. Turns base-64 encoding on. Default: compressed
+    --error-correction CORRECTION
+        Sets the error correction level. Options are L, M, Q, and H. Default: M (25%)
+    --filename FILENAME
+        Set the restored filename. Max 32 chars. Default: same as <FILE>
+    --page WIDTH_POINTS HEIGHT_POINTS
+        Sets the usable size of the paper on your printer. This should NOT be 8.5 x 11 -- make sure to include margins. Default: 500x600
+    --qr-version VERSION
+        Uses QR codes, version VERSION. Versions range from 1-40. The bigger the version, the harder to scan but the more data per code. Default: 10
+    --scale SCALE
+        Scale QR codes so that each small square in the QR code is SCALE x SCALE pixels. Default: 8
+    --base64
+        Force base64 encoding. Default: turned on if needed
+    --verbose, -v
+        Print more detailed information during run
+
+The QR mode is always binary with no QR compression.
+
+The output is named <FILE>.qr.pdf
+```