Create a page about why you can trust HF

[warpech]

Description

The page could simply be called "Quality". On it, we should mention that:

• the development started as an R&D project funded by the EU that was successfully executed and positively evaluated by the The National Centre for Research and Development in Poland
• the development was done by an expert team consisting of people with MS and PhD in Computer Science and Mathematics
• our code is verified by more than 4400 unit tests
• very high test coverage (95%)
• the whole source code is available on GitHub and can be read to increase the customer's confidence
• it is used by Handsontable, a popular data grid solution in JavaScript, and many other projects
• we have (or will) tested the correctness at scale by XLSX/CSV tests https://github.com/handsontable/hyperformula/issues/911

This should be discussed with @krzysztofspilka

Links

Type of issue

• [ ] Missing documentation
• [ ] Error in the documentation
• [ ] Request for a demo
• [x] Request for a tutorial, guide etc.
• [ ] Other issues, suggestions or ideas