Add page size configurability

README.md

@@ -38,3 +38,30 @@ borders between each label:
 
 Run `qr_labels -help` for all command line parameters.
 
+```
+Usage of qr_labels:
+  -borders
+        print borders between labels
+  -code string
+        string to turn into a QR code (URL, text etc)
+  -code-is-label
+        use the -code as the -label
+  -cols uint
+        number of columns on the page (default 3)
+  -font string
+        name of the font (default "Helvetica")
+  -font-size float
+        font-size, in pts (default 24)
+  -font-style string
+        font style, combine 'B', 'U', 'S', 'I' characters
+  -label string
+        label (printed above QR code)
+  -output string
+        filename to write the PDF
+  -page-size string
+        page size (A1, A2, A3, A4, A5, A6, A7, Letter, Legal, Tabloid) (default "A4")
+  -rows uint
+        number of rows on the page (default 4)
+  -size float
+        size of the QR code (default 50)
+```