fix documentation for install into empty directory

[oupala]

Describe the bug
The documentation can be confusing about how to install UUV.

To Reproduce
Steps to reproduce the behavior:

1. Create an empty directory: mkdir test-uuv
2. Go into this directory: cd test-uuv
3. Install UUV as stated in the documentation: npm install --save-dev @uuv/cypress
4. Compare the content of the directory with the contente expected as stated in the documentation

Expected behavior
As stated in the documentation:

uuv/
  cypress.config.ts
  cypress/
    support/
      command.ts
.cypress-cucumber-preprocessorrc.json  

The real content of the directory is:

node_modules
package.json
package-lock.json

The documentation should mention that the install should be made in an existing npm project. In other words, if the directory is empty, you should create a valid package.json file by creating the file manually or by launching a git init command.

[oupala]

By the way, I think that an automatically generated file must have been generated on windows and the linefeeds are converted to linux on commit:

$ git add package-lock.json .gitignore  package-lock.json  uuv/
warning: Les CRLF seront remplacés par des LF dans uuv/.cypress-cucumber-preprocessorrc.json.
Le fichier conservera ses fins de ligne d'origine dans votre copie de travail

[luifr10]

Thank you for creating this issue @oupala