Publish Nerbus source snapshot and build documentation

README.md

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+# Nerbus Explorer
+
+NRB block explorer based on [eIquidus](https://github.com/team-exor/eiquidus).
+The running site is https://explorer.nerbus.com. This repository contains the
+deployed application source, the Nerbus branding, mainnet identity check, and
+network status integration. Production credentials and databases are excluded.
+
+## Setup
+
+Install a Node.js version supported by `package.json`, npm, and MongoDB 7.
+
+```sh
+npm ci
+cp settings.nerbus.example.json settings.json
+```
+
+Edit `settings.json` with your private MongoDB and loopback NRB RPC credentials.
+Use port 39441 and the Nerbus mainnet genesis configured in the example. Enable
+`txindex=1` and `addressindex=1` on the node before indexing. Node startup is
+performed separately by its operator. Start the explorer using its npm scripts
+or the process manager described in `README.upstream.md`.
+
+The interface and NRB branding are English. Both explorer and wallet verify the
+expected genesis identity. When the node is unavailable, the explorer displays
+network status rather than fabricated balances or blocks.
+
+## Wallet network API
+
+The optional bridge is maintained in the
+[wallet repository](https://git.nerbus.com/nerbus/nerbus-wallet/src/branch/main/server).
+It exposes only public address queries and signed transaction broadcast. It
+does not hold private keys. Reverse-proxy `/wallet/v1` over HTTPS to its loopback
+listener, following the included service configuration.
+
+## License and attribution
+
+See `LICENSE`, `README.upstream.md`, and the original source headers. The public
+Nerbus repository starts from a snapshot of the deployed explorer source.