feat(): add samples for account endpoints. Breaking change: getFeeRate takes an object

examples/apidoc/V5/Account/get-mmp-state.js

@@ -0,0 +1,16 @@
+const { RestClientV5 } = require('bybit-api');
+
+const client = new RestClientV5({
+  testnet: true,
+  key: 'apikey',
+  secret: 'apisecret',
+});
+
+client
+  .getMMPState('ETH')
+  .then((response) => {
+    console.log(response);
+  })
+  .catch((error) => {
+    console.error(error);
+  });