Gh-3192: Improve README and GitPod config

[GCHQDeveloper314]

Related issue

• Resolve #3192

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.69%. Comparing base (da9ba67) to head (7936ac8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3193 +/- ## ========================================== Coverage 66.69% 66.69% Complexity 2558 2558 ========================================== Files 907 907 Lines 29068 29068 Branches 3241 3241 ========================================== Hits 19387 19387 Misses 8248 8248 Partials 1433 1433 ```

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