Add Nado exchange support to README

- Included details for the Nado USDC perpetuals, specifying required environment variables and configuration options.
- Updated both English and Chinese versions of the README to reflect the new exchange integration, enhancing user guidance and clarity.

README.md

@@ -41,6 +41,7 @@ A Bun-powered multi-exchange perpetuals workstation that ships an SMA30 trend en
 | Lighter | zkLighter 永续 | `LIGHTER_ACCOUNT_INDEX`, `LIGHTER_API_PRIVATE_KEY` | 默认 `LIGHTER_ENV=testnet`
 | Backpack | USDC 永续 | `BACKPACK_API_KEY`, `BACKPACK_API_SECRET`, `BACKPACK_PASSWORD` | `BACKPACK_SANDBOX=true` 启用沙盒
 | Paradex | StarkEx 永续 | `PARADEX_PRIVATE_KEY`, `PARADEX_WALLET_ADDRESS` | `PARADEX_SANDBOX=true` 使用测试网
+| Nado | USDC 永续 | `NADO_SIGNER_PRIVATE_KEY`, `NADO_SUBACCOUNT_OWNER` | `NADO_ENV` 可切换 `inkMainnet`/`inkTestnet`
 
 ## 系统要求
 - Bun ≥ 1.2（需同时包含 `bun`、`bunx` 命令）

README_en.md

@@ -37,6 +37,7 @@ If you'd like to support this project and get fee discounts, please consider usi
 | Lighter | zkLighter perpetuals | `LIGHTER_ACCOUNT_INDEX`, `LIGHTER_API_PRIVATE_KEY` | Defaults to `LIGHTER_ENV=testnet` |
 | Backpack | USDC perpetuals | `BACKPACK_API_KEY`, `BACKPACK_API_SECRET`, `BACKPACK_PASSWORD` | Set `BACKPACK_SANDBOX=true` for the sandbox |
 | Paradex | StarkEx perpetuals | `PARADEX_PRIVATE_KEY`, `PARADEX_WALLET_ADDRESS` | Toggle `PARADEX_SANDBOX=true` for the testnet |
+| Nado | USDC perpetuals | `NADO_SIGNER_PRIVATE_KEY`, `NADO_SUBACCOUNT_OWNER` | Switch `NADO_ENV` between `inkMainnet` and `inkTestnet` |
 
 ## Requirements
 - Bun >= 1.2 (both `bun` and `bunx` on PATH)