Update documentation with command options

README.md

@@ -3,8 +3,18 @@ The goal of this project is to convert an EBU STL (Tech 3264) binary file and pr
 
 Outptut formats supported:
 - TTML text captions using regions for vertical placement and in-line text colour styling with spans
-- WebVTT with vertical placement and colur support using cue::color styling
+- WebVTT with vertical placement and colour support using cue::color styling
 
+```
+STL2TTML Options:
+
+ -f | -file              STL file to process
+ -o | -offset            number of seconds to add to the STL timing
+ -t | -ttml              Create TTML file
+ -v | -vtt               Create VTT file
+-ns | -no-vtt-styling    Disable all VTT Styling
+```
+
 # References
 - https://tech.ebu.ch/docs/tech/tech3264.pdf
 - https://tech.ebu.ch/docs/tech/tech3360.pdf