Add readthedocs configuration files and first pages

[So-Fras]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [x] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? Add readthedocs configuration files and a few example pages.

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [x] No

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud