docs(install): add x-cmd method to install genact

[lunrenyi]

• Hi, x-cmd is a toolbox for Posix Shell, offering a lightweight package manager built using shell and awk.. It helps you download genact release packages from the internet and extract them into a unified directory for management, without requiring root permissions.

• I mean, can the installation method provided by x-cmd be added to the genact README.md?The installation method for the x command.

  x env use genact

• We wrote a genact introduction article and a demo

[svenstaro]

Hm, I checked out x-cmd since I have never heard about it before. It seems to be at a very early stage. Sorry for making you create this PR but I don't feel comfortable adding and thereby endorsing this way of installing genact.

I'm not saying never but maybe at a later when if/when it has established itself a little bit more in the ecosystem?

It looks like a really cool project, though!

[lunrenyi]

Hm, I checked out x-cmd since I have never heard about it before. It seems to be at a very early stage. Sorry for making you create this PR but I don't feel comfortable adding and thereby endorsing this way of installing genact.

I'm not saying never but maybe at a later when if/when it has established itself a little bit more in the ecosystem?

It looks like a really cool project, though!

Okay, thank you for your response.