docs: update index page

docs/index.md

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 # Welcome
 
-**Note:** More information will be coming soon!
-
 ## About
 
-Phable is an open source, simple, modern Python toolkit for basic client connectivity to a [Project Haystack](https://project-haystack.org/) defined server application.
+Phable is an open source, simple, modern Python toolkit for basic client connectivity to [Project Haystack](https://project-haystack.org/) and [Haxall](https://haxall.io/) defined server applications.
+
+Phable is free to use and permissively licensed under the MIT license.
+
+Project Haystack features include:
+
+ - Reading `site`, `equip`, and `point` entities
+ - Reading current values of real-time data points
+ - Supervisory control of real-time data points
+ - Reading history data for data points
+ - Writing history data to already established data points
+
+Haxall features include:
+
+ - All Project Haystack features listed above
+ - Add, update, and remove commit operations
+ - Evaluation of an Axon string expression
 
 Learn more about `Phable` by exploring the documentation!