chore: Add readme badges (#839)

Co-authored-by: Martin Adámek <banan23@gmail.com>

Author: janbuchar

README.md

@@ -1,5 +1,10 @@
 # Apify API client for JavaScript
 
+[![npm version](https://badge.fury.io/js/apify-client.svg)](https://www.npmjs.com/package/apify-client)
+[![Downloads](https://img.shields.io/npm/dm/apify-client.svg)](https://www.npmjs.com/package/apify-client)
+[![Chat on discord](https://img.shields.io/discord/801163717915574323?label=discord)](https://discord.gg/jyEM2PRvMU)
+[![Build Status](https://github.com/apify/apify-client-js/actions/workflows/check.yaml/badge.svg?branch=master)](https://github.com/apify/apify-client-js/actions/workflows/check.yaml)
+
 `apify-client` is the official library to access [Apify API](https://docs.apify.com/api/v2) from your
 JavaScript applications. It runs both in Node.js and browser and provides useful features like
 automatic retries and convenience functions that improve the experience of using the Apify API.