Update README to include link to atomvm.net
This adds information about the full documentation and creates a build status
badge for ESP32 builds.
@@ -24,6 +24,7 @@ might be supported in a near future.
Getting Started
===============
+There is much more information, including a more complete "Getting Started Guide," extensive documentation, examples, and contact information available on the [AtomVM](https://atomvm.net) project website.
Dependencies
------------
