docs: add vscode devcontainer to readme

[kvokka]

Add mention about vscode devcontainer feature, which I already created for this tool

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 6.47%. Comparing base (0125d86) to head (1a66dbf).
Report is 142 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (0125d86) and HEAD (1a66dbf). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (0125d86)	HEAD (1a66dbf)
	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #233       +/-   ##
==========================================
- Coverage   21.96%   6.47%   -15.50%     
==========================================
  Files           8      32       +24     
  Lines         346    1653     +1307     
==========================================
+ Hits           76     107       +31     
- Misses        264    1537     +1273     
- Partials        6       9        +3     

Flag	Coverage Δ
go-1.23	6.47% <ø> (?)
go-1.24	6.47% <ø> (?)
ubuntu-latest	6.47% <ø> (?)

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