Adding simple dev container

[turnmanh]

What does this implement/fix? Explain your changes

• Adding simple dev container s.t. new users can execute the tutorials right away and experiment with the toolkit w/o having to install it.
• Adapts the README by explaining this option.

Does this close any currently open issues?

Fixes #1052, #554

Checklist

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[turnmanh]

@Ziaeemehr, once you have the image, I'll adapt the container to use it.

[janfb]

Our organization settings are such that anyone can directly create a code-space inside the sbi repository. This works already, opening a vs-code instance running in the browser. However, the required packages are not installed.

So I guess what is left to do is to find a way to pre-install the requirements defined in pyproject.toml on opening a new code-space. @turnmanh or @Ziaeemehr would you be up for looking into this?

[turnmanh]

Yes, providing a pre-setup container incl. the dependencies was the goal for this PR. I'll look into it and provide the req. functionality @janfb.

[codecov[bot]]

Codecov Report

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

Project coverage is 72.91%. Comparing base (8efb8e4) to head (30f81ed). Report is 1 commits behind head on main.

:exclamation: Current head 30f81ed differs from pull request most recent head 0c4cc85

Please upload reports for the commit 0c4cc85 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1070       +/-   ##
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- Coverage   83.69%   72.91%   -10.79%     
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  Files          93       93               
  Lines        7397     7399        +2     
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- Hits         6191     5395      -796     
- Misses       1206     2004      +798     

Flag	Coverage Δ
unittests	72.91% <ø> (-10.79%)	:arrow_down:

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see 25 files with indirect coverage changes

[turnmanh]

@janfb, I've adapted the following:

• pipeline only runs once a release is published → makes sense as we only install the released version of the pkg.
• linked an overview of GH Codespaces to inform possible users

[janfb]

There is a conflict with the README on main. I can fix it and will merge it then 👍