docs: added summary section to contributing docs

[dreamorosi]

Description of your changes

Following some confusion from community contributors and maintainers alike this PR adds a terse TL;DR; (aka too long; didn't read) section at the top of the CONTRIBUTING.md document to allow new contributors more easily get started.

How to verify this change

Check changes in the Markdown file, preview below:

Related issues, RFCs

N/A

PR status

Is this ready for review?: YES
Is it a breaking change?: NO

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• The code coverage hasn't decreased
• The PR title follows the conventional commit semantics

Breaking change checklist

N/A

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[ijemmy]

Not sure about the 2nd proposed change. May be too long?

But I do feel that we shouldn't use "TL;DR;" here. It is like telling them that it is ok to not read.

[dreamorosi]

Not sure about the 2nd proposed change. May be too long?

But I do feel that we shouldn't use "TL;DR;" here. It is like telling them that it is ok to not read.

I like both your proposals better, thanks for the suggestions. Updated also the title of the PR.

[saragerion]

Added a minor suggestion :) thanksss