[resoto][docs] Add an example of the rendering script usage

[meln1k]

Description

Added the graph rendering script instructions in the readme

To-Dos

• Add test coverage for new or updated functionality
• Lint and test with tox
• Document new or updated functionality (someengineering/resoto.com#XXXX)

Code of Conduct

By submitting this pull request, I agree to follow the code of conduct.

[aquamatthias]

The project README is very high level. I feel the diagram tool is too specific here - so people get confused.

Proposals:

• this kind of documentation should be part of the script itself
• we probably should have a section on our docs site explaining the usage (e.g. a section called add ons or integrations or similar)
• if we find a good example diagram, we cam put it in the README

[codecov-commenter]

Codecov Report

Merging #773 (2b9c9ee) into main (635a782) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #773      +/-   ##
==========================================
+ Coverage   89.75%   89.78%   +0.03%     
==========================================
  Files          69       69              
  Lines        9737     9934     +197     
==========================================
+ Hits         8739     8919     +180     
- Misses        998     1015      +17     

Flag	Coverage Δ
resotocore	89.78% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
resotocore/resotocore/__init__.py	100.00% <100.00%> (ø)
resotocore/resotocore/__main__.py	88.66% <100.00%> (+0.98%)	⬆️
resotocore/resotocore/cli/command.py	87.20% <100.00%> (+0.26%)	⬆️
resotocore/resotocore/core_config.py	94.81% <100.00%> (-1.98%)	⬇️
resotocore/resotocore/dependencies.py	87.60% <100.00%> (+1.65%)	⬆️
resotocore/resotocore/parse_util.py	100.00% <100.00%> (ø)
resotocore/resotocore/cli/cli.py	92.97% <0.00%> (-1.19%)	⬇️
resotocore/resotocore/web/certificate_handler.py	92.72% <0.00%> (-0.96%)	⬇️
resotocore/resotocore/model/model.py	92.56% <0.00%> (-0.95%)	⬇️
... and 8 more

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