Publish Nerbus source snapshot and build documentation

README.md

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+# Nerbus Wallet
+
+Nerbus Wallet 0.2.1 is a Qt desktop wallet for transparent NRB addresses.
+Private keys and transaction signatures stay on the user's computer. Receiving
+addresses can be created offline without a local daemon or mandatory password.
+Password encryption can be enabled in **Wallet & backup**.
+
+Balance, public address history, spendable outputs, and signed transaction
+broadcasts use `https://explorer.nerbus.com/wallet/v1`. This is a lightweight
+wallet; it relies on that server for network data rather than validating the
+whole chain. Shielded transfers, staking, and identity operations are outside
+the current interface.
+
+The current application entry point is `wallet_app.cpp`. Key storage is in
+`wallet_store.cpp`. The offline signing helper in `core/` uses the Nerbus Core
+cryptographic and transaction implementation. It does not start a node.
+
+Read [README.txt](README.txt) for wallet files and backups, and
+[BUILD.md](BUILD.md) for Windows and Linux build instructions.
+New wallets are unencrypted unless the owner enables a password. Back up again
+after adding addresses; older backups do not contain later keys.
+
+Windows and Linux packages are being prepared separately. No binaries or
+release assets are included in this source repository.
+
+## License
+
+See `COPYING`, `core/COPYING`, and the original source headers. Qt and libsodium
+retain their respective licenses. Core source: https://git.nerbus.com/nerbus/nerbus