Replace NX's README.md by the NXPM one

[Ruslan Gonzalez]

Expected Behavior

It would be better to have NXPM README.md instead of the NX one since there are some instructions that are necessary.

Current Behavior

Currently the README.md is the one provided by the NX workspace.

Possible Solution

Replace README.md

[beeman]

This is a great point.

As a start, I think it would be nice to list similar instructions to those are currently printed after installation:

>  NXPM   INFO  Installation finished
>  NXPM   INFO  To get started         : cd my-stack
>  NXPM   INFO  Start database servers : docker-compose up
>  NXPM   INFO  Run setup              : yarn setup
>  NXPM   INFO  Start API              : yarn dev:api
>  NXPM   INFO  Start Web              : yarn dev:web

And probably a link to Nx' documentation. And very open for other suggestions.

[Ruslan Gonzalez]

@beeman definitely an awesome idea!