Add vendor: Solomining

[Bitcoinite]

What's in this PR

Type: New vendor listing

---

About your shop

Replace the example values below with your real details.

Shop name	Solomining
Website	https://solomining.de/
Region	Europe
Where to find you in the community	https://x.com/solo_mining

---

Vendor confirmation

Use Yes/No for each line. Keep the text and just replace the value.

I sell genuine Bitaxe hardware	Yes
My shop is live and active	Yes
I am reachable in the community	Yes
I am not aware of open fraud or counterfeit reports about my shop	Yes
I understand listings can be removed if confirmed issues arise	Yes

---

Anything else the community should know?

[skot]

LGTM. thanks @Bitcoinite

[DerekLoadout]

Thanks for the submission, this is looking great 🙌

I applied a small naming fix on your branch so it matches our validator rules exactly:

vendors/Solomining.json -> vendors/solomining.json
logos/Solomining.png -> logos/solomining.png
Updated logo in the JSON to solomining.png
Why: in this repo, slug, vendor filename, and logo filename must match exactly (including lowercase).

At this point, your PR is waiting on workflow approval/re-run. Once that check is approved and passes, this should be merge-ready ✅