docs: add diegovilar as a contributor for code

[allcontributors]

Adds @diegovilar as a contributor for code.

This was requested by nartc in this comment

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit bf4cbdf. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

⌛ The following targets are in progress

• nx affected --target=test --parallel=3 --ci --code-coverage
• nx affected --target=lint --parallel=3
• nx affected --target=build --parallel=3 --exclude=docs

✅ Successfully ran 1 target

• nx-cloud record -- pnpm exec nx format:check

---

Sent with 💌 from NxCloud.