Add logo in readme

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

README.md

@@ -1,8 +1,20 @@
-# go-reddit
+<div align='center'>
+<br />
+<img src='./images/logo.png' alt='go-reddit logo' height='150'>
+
+---
+
+<div id='badges' align='center'>
 
 [![Actions Status](https://github.com/vartanbeno/go-reddit/workflows/tests/badge.svg)](https://github.com/vartanbeno/go-reddit/actions)
 [![Go Report Card](https://goreportcard.com/badge/github.com/vartanbeno/go-reddit)](https://goreportcard.com/report/github.com/vartanbeno/go-reddit)
 
+</div>
+
+</div>
+
+## Overview
+
 **Featured in [issue 327 of Golang Weekly](https://golangweekly.com/issues/327) 🎉**
 
 go-reddit is a Go client library for accessing the Reddit API.