README update

Author: tigusigalpa

README.md

@@ -1,8 +1,12 @@
 # zoomex-go
 
+![Zoomex Golang Client SDK](https://github.com/user-attachments/assets/12509388-9e00-4dff-9e03-bc5124b0177c)
+
 Go client for [Zoomex](https://www.zoomex.com) cryptocurrency exchange API v3. Covers REST and WebSocket endpoints.
 
-If you're building a trading bot, market data collector, or portfolio tracker in Go and need to interact with Zoomex — this package wraps the whole v3 API so you don't have to deal with raw HTTP requests, signature generation, or WebSocket connection management yourself.
+If you're building a trading bot, market data collector, or portfolio tracker in Go and need to interact with Zoomex —
+this package wraps the whole v3 API so you don't have to deal with raw HTTP requests, signature generation, or WebSocket
+connection management yourself.
 
 Works with both testnet and mainnet. Supports linear and inverse perpetual contracts.
 
@@ -127,18 +131,21 @@ ws := zoomex.NewWebSocket(
 
 Base URLs used under the hood:
 
-| | REST | WebSocket |
-|---|---|---|
-| **Mainnet** | `https://openapi.zoomex.com` | `wss://stream.zoomex.com/v3/private` |
+|             | REST                                 | WebSocket                                    |
+|-------------|--------------------------------------|----------------------------------------------|
+| **Mainnet** | `https://openapi.zoomex.com`         | `wss://stream.zoomex.com/v3/private`         |
 | **Testnet** | `https://openapi-testnet.zoomex.com` | `wss://stream-testnet.zoomex.com/v3/private` |
 
 ## Authentication
 
-Private endpoints are signed with HMAC_SHA256. Pass your API key and secret via `WithAPIKey` / `WithSecretKey` — the client builds the signature and sets `X-BAPI-*` headers on each request automatically. You don't need to calculate timestamps or sign anything manually.
+Private endpoints are signed with HMAC_SHA256. Pass your API key and secret via `WithAPIKey` / `WithSecretKey` — the
+client builds the signature and sets `X-BAPI-*` headers on each request automatically. You don't need to calculate
+timestamps or sign anything manually.
 
 Public endpoints (market data) don't require credentials.
 
-Testnet and mainnet are toggled with `WithTestnet(true|false)`. Get your testnet keys at [testnet.zoomex.com](https://testnet.zoomex.com).
+Testnet and mainnet are toggled with `WithTestnet(true|false)`. Get your testnet keys
+at [testnet.zoomex.com](https://testnet.zoomex.com).
 
 ## Docs