[juandresrodca]

Adds README.es.md (full Spanish translation of README.md) and a small language pointer at the top of README.md linking to it. Code samples unchanged; only prose and inline code comments are translated.

[juandresrodca]

Hi! 👋

I really enjoyed reading through this project and noticed there's no Spanish translation of the README. Given the growing .NET / ReactiveUI community in Latin America and Spain, I thought it would be a nice addition.

What this PR does:

Adds README.es.md — a full Spanish translation of README.md.
Adds a one-line language pointer near the top of README.md linking to it.
What it doesn't do:

No code, behavior, or build changes — docs only.
Code samples are kept identical; only prose and inline code comments are translated.
Happy to adjust wording or terminology if you'd prefer different phrasing in any section. Thanks for maintaining this library!

Cheers.

[glennawatson]

Thanks, approved and merged.

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