Added Announcement

Fixes # 86

Author: luciajimenez

README.md

@@ -28,6 +28,8 @@ If you are looking for the SendGrid API client library, please see [this repo](h
 
 All updates to this project is documented in our [CHANGELOG](https://github.com/sendgrid/csharp-http-client/blob/master/CHANGELOG.md).
 
+If you're a software engineer who is passionate about #DeveloperExperience and/or #OpenSource, this is an incredible opportunity to join our #DX team as a Developer Experience Engineer and work with @thinkingserious and @aroach! Tell your friends :)
+
 <a name="installation"></a>
 # Installation