feat: Add logo and example in Readme

[statnmap]

tags: feat, doc

Why?

• "Pour le plaisir"
• Present to the user how to use the package in the Readme

How?

• Logo in man/figures/logo.png to be recognized by pkgdown

issue #80

• Does my code meet the quality standards for release packages?
• Does the reviewer have all the information to validate the features/issues without too much research?
• Does the customer who will validate the associated tickets have the information to do so without wasting time?

Issues to validate to close :

• [ ] issue #

Processed issues to keep open or in progress:

• [ ] issue #

Checklist:

• [ ] Does the package check works locally?
• [ ] Does the CI pass?
• [ ] Are the added / fixed features documented, tested?
• [ ] Are the added features / solved problems briefly presented in the PR message?
• [ ] Are the changes related to tickets / issues that I have listed in the commits and in the PR itself?
• [ ] Are the tickets in "review" mode in the Project Tracking Board?
• [ ] Does each ticket, if it is to be closed after acceptance of the PR, contain a comment that tells how to validate it?

[codecov[bot]]

Codecov Report

Merging #81 (be33686) into main (af1f142) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   71.92%   71.92%           
=======================================
  Files           7        7           
  Lines         716      716           
=======================================
  Hits          515      515           
  Misses        201      201           

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