Add esp32-nut to DIY Projects

[maverick1982]

I would like to submit esp32-nut to the DIY Projects section.

esp32-nut solves a common pain point for Home Assistant users: monitoring a USB UPS that isn't physically close to the HA server. Instead of setting up a dedicated Raspberry Pi or running long USB cables, this open-source firmware turns a cheap ESP32-S3 into a standalone NUT (Network UPS Tools) server.

It reads HID data directly from the UPS via USB and exposes it over Wi-Fi, allowing the native Home Assistant NUT integration to connect to it seamlessly.

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Checking 1 entry out of 325 total.

Awesome list validation

❌ Blocking errors -- validated 1 entry: 1 error, 0 warnings.

Please address the errors below before this PR can be merged.

Entries checked

Entry	Section	URL
esp32-nut	DIY › 🔨 DIY Projects	https://github.com/maverick1982/esp32-nut

Errors (1)

• esp32-nut — DIY › 🔨 DIY Projects: Repository created 2026-07-18 — must be at least 6 months old.
  • https://github.com/maverick1982/esp32-nut

What was checked

• URL hygiene (HTTPS, no shorteners, no duplicates, no tracking params)
• Repository status (not archived, age ≥6 months, last push <18 months)
• License (OSI-approved; CC accepted for Other Awesome Lists)
• README presence and Home Assistant mention
• HACS structure (hacs.json) for Custom Integrations and Custom Cards

Full criteria: .github/CONTRIBUTING.md.