更新文档，添加和修改多个API接口的描述，确保文档内容的准确性和完整性，提升开发者使用体验。

src/exchanges/grvt/client.ts

@@ -0,0 +1,28 @@
+import { GrvtClient, GrvtWsClient, EGrvtEnvironment } from "@grvt/sdk";
+
+export interface GrvtCredentials {
+  apiKey: string;
+  apiSecret: string;
+  env: EGrvtEnvironment;
+  subAccountId: string;
+  instrument: string;
+}
+
+export class GrvtGateway {
+  private readonly grvtClient: GrvtClient;
+  private readonly wsClient: GrvtWsClient;
+
+  constructor(private readonly credentials: GrvtCredentials) {
+    this.grvtClient = new GrvtClient({
+      apiKey: credentials.apiKey,
+      apiSecret: credentials.apiSecret,
+      env: credentials.env,
+    });
+    this.wsClient = new GrvtWsClient({ apiKey: credentials.apiKey, env: credentials.env });
+  }
+
+  async initialize(): Promise<void> {
+    await this.wsClient.connect();
+  }
+}
+