Added grammar for reMarkable note pages

[alessionossa]

Add grammar for reMarkable pages.

Credits to the following posts/articles for decoding

• https://plasma.ninja/blog/devices/remarkable/binary/format/2017/12/26/reMarkable-lines-file-format.html
• https://remarkablewiki.com/tech/filesystem#lines_file_format
• https://www.reddit.com/r/RemarkableTablet/comments/7c5fh0/work_in_progress_format_of_the_lines_files/
• https://www.reddit.com/r/RemarkableTablet/comments/ow6nr9/updated_spec_for_notebook_format/

[synalysis]

thank you!