Update README.md (#112)

Modernize the readme a bit

Signed-off-by: Henrik Areskoug <67931019+hareskoug@users.noreply.github.com>

README.md

@@ -1,12 +1,17 @@
 ## Overview
 Visier, Inc. publishes the [OpenAPI v3](https://spec.openapis.org/oas/latest.html) definitions of a growing list of its public APIs to ease the development of client applications against the Visier platform. OpenAPI v3 is a language-agnostic definition, enabling (among other things) the programmatic generation of client-level interface wrappers that substantially reduce the amount of code that has to otherwise be written manually in libraries or directly in applications.
 
-Presently, OpenAPI v3 definitions are available of Visier's Authentication APIs as well as Query and Data Model APIs.
+Visier's Public APIs are classified according to:
+* **Administration** - APIs to perform administrative tasks such as managing permissions.
+* **Authentication** - Get secure access to the Visier platform.
+* **Data-In** - APIs for loading data and monitoring jobs.
+* **Data-Out** - Query and data extraction APIs.
+* **Modeling** - Query the Visier catalog for object metadata.
 
 ## Usage
-At present time, only the OpenAPI v3 definitions are published; at present time, Visier does not publish additional libraries and samples that are geared towards a particular kind of wrapper. 
+Visier usese these definitions to generate end-user content like reference documentation as well as SDKs (currently Python is available).
 
-Developers are required to generate the API wrappers using a tool of their choice and then write their application to make Visier public API calls using these wrappers.
+Developers using other languages are encouraged to generate the API wrappers using a tool of their choice and then write their application to make Visier public API calls using these wrappers.
 
 OpenAPI v3 client-wrappers can be generated using freely available tools as well as using commercially supported options.