Shader with an alpha property/variable

Hello!
I've been working on a game recently and I need some help with something.
I need a shader that has an alpha property to it (meaning transparency level) to do something like peaceable objects in the Rust game:

The thing is, I know very little of creating shaders and therefore would really appreciate if someone shared a shader like that here.

Thanks!!

 

Nevermind I got it, just use the shader particles --> alpha blended and choose the right alpha value thanks

 

You can also use the fade option on the standard shader.