[doc] add man page

[lguist]

Related to: #87
The man.rs file can generate the manpage with this command:
cargo run --bin man > /tmp/fw.man; man /tmp/fw.man
I generate this draft by copying from the --help info.
Although I think it would be also usefull to have a fw man that calls the manpage, i don't know if fw is shipped to a package mannager and if that's the case, what's the best option ?
Question:
The author should be brocode or bomgar ?

[bomgar]

Thanks. I should have some time on the weekend to review this. The only maintained package I know of is this one: https://aur.archlinux.org/packages/fw

Author or contact (or whatever is available) should be bros@brocode.sh

[bomgar]

I looked at it. Looks nice for a first draft. My suggestion would be to automate the creation during the github build and publish it with the release binary. I don't think it should be available with fw man. People building packages could just add the prebuild page to the package. I will do this for the archlinux package.

For that reason I don't like that the man dependency is now part of the main build file. I would suggest to move everything related to the man page to a subdirectory.

As for content: I think a lot of the readme could be included.

[lguist]

Thanks for the feedback, I will work on these changes.

[lguist]

I added the Readme and Usage section to the man page, i think (if you like to) i can make a custom formatting for make a section split between Readme and Usage. I splitted every paragraph in a hope it will be easier to an future update in the man page.

I also tried to write the github workflow to build the man page, although I'm not used to github action so i don't know if it works and i didn't get it to run on my fork (that's why i accidentally close this pull, sorry). Anyway if you think it's better do this other way or something new to add, let me know.

[bomgar]

mixing run and args looks wrong to me. I'm a bit busy a the moment so I'll test this later.

[bomgar]

merged

[bomgar]

The github actions are super annoying. I merged it to be able to test this easier.