Add ethereum-json-rpc.com

[Destiner]

Adds a link and a short description for ethereum-json-rpc.com.

Description

Adds a paragraph to the "Execution client spec" section on the "JSON-RPC" page, highlighting "Ethereum JSON RPC" tool — the interactive API playground for Ethereum JSON-RPC spec. One distinctive feature of the tool is that it allows the user to execute methods right from the browser.

The playground is open-source.

Disclaimer: I am the creator of the tool.

Recreating the PR to fix the file path.

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[wackerow]

This is great, thanks @Destiner!

I'm wondering if we want to highlight this a little bit more... It seems like it was kinda just plopped in that section.

What if add a heading just above the "JSON-RPC API Methods" section, ie: "JSON-RPC API playground", and had a sentence or two guiding people to this as an option to try out the endpoints found below?

[Destiner]

Hey @wackerow!

That makes sense. I've updated the copy as per your suggestion.

[wackerow]

Great! Thanks @Destiner, very nice tool that has always been missing here.

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[wackerow]

@all-contributors please add @Destiner for tool

[allcontributors]

@wackerow

I've put up a pull request to add @Destiner! 🎉