Add NIP-95 upload endpoint documentation to README

README.md

@@ -28,6 +28,20 @@ npm run dev
 ## Environment Variables
 
 - `NEXT_PUBLIC_NOSTR_RELAY_URL`: Nostr relay URL (default: wss://relay.damus.io)
+- `NEXT_PUBLIC_NIP95_UPLOAD_URL`: NIP-95 media upload endpoint URL (required for image/video uploads)
+
+### NIP-95 Upload Service
+
+The application requires a NIP-95 compatible upload service for media uploads (images and videos). You can use services like:
+- [nostr.build](https://nostr.build/) - Public NIP-95 service
+- [void.cat](https://void.cat/) - Another public NIP-95 service
+- Or host your own NIP-95 compatible service
+
+Example `.env.local`:
+```
+NEXT_PUBLIC_NOSTR_RELAY_URL=wss://relay.damus.io
+NEXT_PUBLIC_NIP95_UPLOAD_URL=https://nostr.build/api/v2/upload
+```
 
 ## Lightning Wallet Setup