How create plugin for LMS ?

> Because There is "sha" and i don't know generate it

It's a sha1 hash: http://en.wikipedia.org/wiki/Sha1sum

> And How LMS detect the new version of our plugin ?

Once you've set up the repository, let me know, and it'll be included in
the semi-automatically generated repository file used by LMS. This is
eg. http://repos.squeezecommunity.org/extensions.xml for 7.9. Older
versions are hosted on Logitech servers. LMS reads this file every now
and then to check for updates.

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Michael