README: add link to tldr.finzzz.net

[finzzz]

• The PR title conforms to the recommended templates

Fixes: #5287

[CLAassistant]

All committers have signed the CLA.

[bl-ue]

I'm sorry @finzzz I meant issue description, not title. I update it.

[bl-ue]

@finzzz the CLA isn't working because the email address that you used for the commit (git@finzzz.net) isn't added to your GitHub account. To fix this, you can either:

1. Change the email you used for the commit† to one of the emails attached to your GitHub account,

2. Or, preferably (and much easier), add the email you used for this commit (git@finzzz.net) to your GitHub account.

†To change the email address of the last commit, run this command:

git commit --amend --author="Vincent Carlos <email addres that you want to use instead>"

[finzzz]

okay, can you try again?

[bl-ue]

Okay, the commit looks good. Now just sign the CLA.

[sbrl]

Awesome, thanks @finzzz!

The slashes are really just a neatness thing. We can either resolve that here, or open another quick PR to fix it. Either way, I don't think it's blocking this PR from being merged.

[bl-ue]

🚀🚀🚀