Issue #4788 - ESM Module Example

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It's getting incredibly late here, but I mocked up a quick example that demonstrates how to use express via an ESM module. I've been using ECMA modules for a little while now, and can include a much more complex example upon request. There's a bit of power using modules vs. the CommonJS approach. Imho, as an example, it's a bit easier to add middleware. There's a lot of ease, too, when using async.

However, express@^5 is required. I believe this has to do with the impressive compatibility express has kept with the various node versions.

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Whoops, I forgot to mention Issue #4788. I'll include a link back to this there, too.

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Note -- this was ran on the latest LTS version of Node.js.