publish to crates.io

[ahaoboy]

Although cargo can use the git protocol, it may be more convenient if it can be installed on crates.io.
At the same time, llrt has not been published to crates.io. In order to prevent others from registering it first, maybe an empty package can be used as a placeholder?

[richarddavison]

That's the plan! Publish will happen on next release (this week)

[ahaoboy]

Considering that llrt compilation is very complicated, it would be more convenient if it could support cargo-binstall

https://github.com/cargo-bins/cargo-binstall

[alshdavid]

@richarddavison how are ya'll going on publishing to crates.io?