v3.3.4: fix optional param in contract client, add js/ts samples for contract client, fix e2e open interest limit test, update readme

examples/rest-contract-public.ts

@@ -0,0 +1,20 @@
+/**
+ * This is the TypeScript version of the `rest-contract-public.js` sample.
+ */
+
+// For testing with the repo directly, import from the src folder
+import { ContractClient } from '../src';
+
+// or, use the version installed with npm
+// import { ContractClient } from 'bybit-api';
+
+(async () => {
+  const client = new ContractClient();
+
+  try {
+    const orderbookResult = await client.getOrderBook('BTCUSDT', 'linear');
+    console.log('orderbook result: ', orderbookResult);
+  } catch (e) {
+    console.error('request failed: ', e);
+  }
+})();