Add badges in README

Author: notmandatory

README.md

@@ -1,3 +1,13 @@
 # rust-esplora-client
 
-Bitcoin Esplora API client library. Supports plaintext, TLS and Onion servers. Blocking or async
+Bitcoin Esplora API client library. Supports plaintext, TLS and Onion servers. Blocking or async.
+
+<p>
+    <a href="https://crates.io/crates/rust-esplora-client"><img alt="Crate Info" src="https://img.shields.io/crates/v/rust-esplora-client.svg"/></a>
+    <a href="https://github.com/bitcoindevkit/rust-esplora-client/blob/master/LICENSE"><img alt="MIT Licensed" src="https://img.shields.io/badge/license-MIT-blue.svg"/></a>
+    <a href="https://github.com/bitcoindevkit/rust-esplora-client/actions?query=workflow%3ACode%20Coverage"><img alt="CI Status" src="https://github.com/bitcoindevkit/rust-esplora-client/workflows/Code%20Coverage/badge.svg"></a>
+    <a href='https://coveralls.io/github/bitcoindevkit/rust-esplora-client?branch=master'><img src='https://coveralls.io/repos/github/bitcoindevkit/rust-esplora-client/badge.svg?branch=master' alt='Coverage Status' /></a>
+    <a href="https://docs.rs/rust-esplora-client"><img alt="API Docs" src="https://img.shields.io/badge/docs.rs-rust-esplora-client-green"/></a>
+    <a href="https://blog.rust-lang.org/2021/11/01/Rust-1.56.1.html"><img alt="Rustc Version 1.56.1+" src="https://img.shields.io/badge/rustc-1.56.1%2B-lightgrey.svg"/></a>
+    <a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>
+</p>