feat(): update basic spot/futures examples with initial types

examples/deprecated-V1-REST/rest-private-futures.ts

@@ -0,0 +1,38 @@
+import { FuturesClient, WebsocketClient } from '../../src/index';
+
+// or
+// import { SpotClient } from 'bitget-api';
+
+// read from environmental variables
+const API_KEY = process.env.API_KEY_COM;
+const API_SECRET = process.env.API_SECRET_COM;
+const API_PASS = process.env.API_PASS_COM;
+
+const client = new FuturesClient({
+  apiKey: API_KEY,
+  apiSecret: API_SECRET,
+  apiPass: API_PASS,
+  // apiKey: 'apiKeyHere',
+  // apiSecret: 'apiSecretHere',
+  // apiPass: 'apiPassHere',
+});
+
+/** This is a simple script wrapped in a immediately invoked function expression, designed to check for any available BTC balance and immediately sell the full amount for USDT */
+(async () => {
+  try {
+    const now = new Date();
+    const toTime = new Date(now.getTime() - 24 * 60 * 60 * 1000);
+
+    console.log(
+      await client.getAccountBill({
+        symbol: 'BTCUSDT_UMCBL',
+        marginCoin: 'USDT',
+        startTime: now.getTime() + '', // should be sent as a string
+        endTime: toTime.getTime() + '', // should be sent as a string
+        pageSize: 100,
+      }),
+    );
+  } catch (e) {
+    console.error('request failed: ', e);
+  }
+})();