Added Solid standard banner to README ;)

Author: davedbase

README.md

@@ -1,4 +1,7 @@
-# Solid Docs
+<p>
+  <img src="https://assets.solidjs.com/banner?project=Solid%20Documentation&type=core" alt="Solid Documentation" />
+</p>
+
 
 Welcome to Solid's documentation!