Adding large logo to README.md

Related to #685, the logo will is hidden on the k8gb.io site while visible on GH.

Signed-off-by: kuritka <kuritka@gmail.com>

README.md

@@ -1,3 +1,6 @@
+<div align="center" class="disable-logo">
+<a href="#"><img src="https://raw.githubusercontent.com/cncf/artwork/master/projects/k8gb/icon/color/k8gb-icon-color.svg" width="200"/></a>
+</div>
 <h1 align=center>K8GB - Kubernetes Global Balancer<a href="https://www.k8gb.io"></h1>
 <p align=center><a href="https://landscape.cncf.io/?selected=k8gb">CNCF Sandbox Project</p>
 <p align=center><a href="https://landscape.cncf.io/card-mode?category=coordination-service-discovery&grouping=category">CNCF Coordination &amp; Service Discovery</p>