initial commit, add bitget rest api and websockets connector

examples/rest-spot-public.ts

@@ -0,0 +1,16 @@
+import { SpotClient } from '../src/index';
+
+// or
+// import { SpotClient } from 'bitget-api';
+
+const client = new SpotClient();
+
+const symbol = 'BTCUSDT_SPBL';
+
+(async () => {
+  try {
+    console.log('getCandles: ', await client.getCandles(symbol, '1min'));
+  } catch (e) {
+    console.error('request failed: ', e);
+  }
+})();