Add Nado documentation and examples, including new API endpoints, FAQs, and guides for using the TypeScript SDK. Update .env.example with additional configuration options.

.env.example

@@ -2,7 +2,7 @@
 LANG=zh
 
 # Exchange selection
-EXCHANGE=aster                       # Pick aster (default) or grvt/lighter/backpack/paradex
+EXCHANGE=aster                       # Pick aster (default) or grvt/lighter/backpack/paradex/nado
 
 # Aster API credentials
 ASTER_API_KEY=
@@ -117,3 +117,26 @@ PARADEX_WALLET_ADDRESS=
 
 # Enable verbose adapter logging: set to "1" or "true"
 # PARADEX_DEBUG=false
+
+# Nado exchange configuration (Ink mainnet)
+# Requires a linked signer private key + your original subaccount owner EVM address.
+# When EXCHANGE=nado these values are used automatically.
+
+NADO_ENV=inkMainnet                   # inkMainnet | inkTestnet
+NADO_SYMBOL=BTC-PERP                  # Trading product symbol (e.g., BTC-PERP / ETH-PERP)
+NADO_SIGNER_PRIVATE_KEY=              # 32-byte 0x-prefixed private key (0x...)
+NADO_SUBACCOUNT_OWNER=                # EVM address of the subaccount owner (0x...)
+NADO_SUBACCOUNT_NAME=default          # Subaccount name (bytes12, default "default")
+
+# Optional: market-order slippage buffer (used for IOC limit-as-market, e.g. 0.01 => 1%)
+NADO_MARKET_SLIPPAGE_PCT=0.01
+
+# Optional: stop trigger source for STOP_MARKET orders (oracle | last | mid)
+NADO_STOP_TRIGGER_SOURCE=oracle
+
+# Optional endpoint overrides
+# NADO_GATEWAY_WS_URL=wss://gateway.prod.nado.xyz/v1/ws
+# NADO_SUBSCRIPTIONS_WS_URL=wss://gateway.prod.nado.xyz/v1/subscribe
+# NADO_ARCHIVE_URL=https://archive.prod.nado.xyz/v1
+# NADO_TRIGGER_URL=https://trigger.prod.nado.xyz/v1
+# NADO_DEBUG=false