Hotfix/readme command

[GuillaumeFalourd]

- What I did

• Update the rit add repo command line in README file.
• Update the Ritchie description in the root file to match Ritchie CLI definition on the Äbout"section on github repo and on the future Landing Page (ongoing).

- How to verify it

• Executing the following command:

echo '{"provider":"Github", "name":"demo", "version":"2.0.0", "url":"https://github.com/ZupIT/ritchie-formulas-demo", "token": null, "priority":1}' | rit add repo --stdin

- Description for the changelog

• Update README file with correct rit add repo stdin command.
• Update the Ritchie description in helper.

[codecov-commenter]

Codecov Report

Merging #547 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #547   +/-   ##
=======================================
  Coverage   78.54%   78.54%           
=======================================
  Files          98       98           
  Lines        3179     3179           
=======================================
  Hits         2497     2497           
  Misses        498      498           
  Partials      184      184           

Impacted Files	Coverage Δ
pkg/cmd/root.go	66.12% <ø> (ø)

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