Adding deprecation notice (#705)

* Adding deprecation notice

* Updating cloud providers

README.md

@@ -1,3 +1,5 @@
+# Mobius development is deprecated and has been superseded by a more recent version '.NET for Apache Spark' from Microsoft ([Website](https://dot.net/spark) | [GitHub](https://github.com/dotnet/spark)) that runs on Azure HDInsight Spark, Amazon EMR Spark, Azure & AWS Databricks.
+
 <img src='logo/mobius-star-200.png' width='125px' alt='Mobius logo' />
 
 # Mobius: C# API for Spark