chore: configure GitHub Codespaces for this project

[AngryMaciek]

Description

So: I was really bored yesterday and decided to learn the GitHub Codespaces mechanism to set up a Cloud dev IDE. These are pretty cool - a whole development environment set up automatically in a container, accessible from a browser. AFAIK works fine; the README badge will become active upon merge to dev branch (currently configuration files are not there yet). In order to test it yourself go to repo page, switch to codespaces branch click green button Code, then Codespaces and another green button to create a codespace.

Type of change

• [x] Other

Checklist

Please carefully read these items and tick them off if the statements are true or do not apply.

• [x] I have performed a self-review of my own code
• [ ] ~My code follows the existing coding style, lints and generates no new warnings~
• [ ] ~I have added type annotations to all function/method signatures, and I have added type annotations for any local variables that are non-trivial, potentially ambiguous or might otherwise benefit from explicit typing.~
• [x] I have commented my code in hard-to-understand areas
• [ ] ~I have added ["Google-style docstrings"] to all new modules, classes, methods/functions or updated previously existing ones~
• [ ] ~I have added tests that prove my fix is effective or that my feature works~
• [ ] ~New and existing unit tests pass locally with my changes and I have not reduced the code coverage relative to the previous state~
• [ ] ~I have updated any sections of the app's documentation that are affected by the proposed changes~

If for some reason you are unable to tick off all boxes, please leave a comment explaining the issue you are facing so that we can work on it together.

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.07 :warning:

Comparison is base (fa369b2) 99.78% compared to head (1401b51) 99.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #123 +/- ## ========================================== - Coverage 99.78% 99.72% -0.07% ========================================== Files 12 12 Lines 948 1078 +130 ========================================== + Hits 946 1075 +129 - Misses 2 3 +1 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/zavolanlab/htsinfer/pull/123/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zavolanlab)

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.

[AngryMaciek]

Org admin needs to adjust the Codespace billing settings so that the org does not pay for everyone who creates Codespaces (see below), rather that you should enforce "Individual billing", i.e. every user pays up from their pool of free codespace minutes (everyone has a personal pool of minutes as for ci).

[AngryMaciek]

(?)

[uniqueg]

:-)