[Readme] add launch banner

README.md

@@ -12,6 +12,15 @@
 [![Twitter](https://img.shields.io/twitter/follow/DrakkarsOctobot.svg?label=twitter&style=social)](https://octobot.click/gh-twitter)
 [![YouTube](https://img.shields.io/youtube/channel/views/UC2YAaBeWY8y_Olqs79b_X8A?label=youtube&style=social)](https://octobot.click/gh-youtube)
 
+## 🎉 OctoBot is launching on Product Hunt on July 10th
+
+<p align="center">
+    <a href="https://www.producthunt.com/posts/octobot-open-source?embed=true&utm_source=badge-featured&utm_medium=badge&utm_souce=badge-octobot&#0045;open&#0045;source" target="_blank"><img src="https://api.producthunt.com/widgets/embed-image/v1/featured.svg?post_id=463219&theme=light" alt="OctoBot&#0032;open&#0032;source - Your&#0032;open&#0032;source&#0032;investment&#0032;strategy&#0032;builder | Product Hunt" style="width: 250px; height: 54px;" width="250" height="54" /></a>
+</p>
+<p align="center">
+    👆 Follow the launch to get your exclusive discount!
+</p>
+
 <p align="center">
   <img src="../assets/illustration.png" alt="Octobot automating trades of its user while the user is relaxing on his couch">
 </p>