Update READMEs.

structurizr-client/README.md

@@ -2,4 +2,10 @@
 
 [![Maven Central](https://img.shields.io/maven-central/v/com.structurizr/structurizr-client.svg?label=Maven%20Central)](https://search.maven.org/artifact/com.structurizr/structurizr-client)
 
-- [Documentation](https://docs.structurizr.com/java/workspace-api)
+This library provides an API client for the workspace and admin APIs provided by the Structurizr cloud service and on-premises installation.
+
+- [Cloud service - Workspace API](https://docs.structurizr.com/cloud/workspace-api)
+- [Cloud service - Admin API](https://docs.structurizr.com/cloud/admin-api)
+- [On-premises installation - Workspace API](https://docs.structurizr.com/onpremises/workspace-api)
+- [On-premises installation - Admin API](https://docs.structurizr.com/onpremises/admin-api)
+- [Workspace API client](https://docs.structurizr.com/java/workspace-api)

structurizr-core/README.md

@@ -2,5 +2,7 @@
 
 [![Maven Central](https://img.shields.io/maven-central/v/com.structurizr/structurizr-core.svg?label=Maven%20Central)](https://search.maven.org/artifact/com.structurizr/structurizr-core)
 
+This library provides the core functionality of Structurizr related to creating workspaces.
+
 - [Documentation](https://docs.structurizr.com/java)
 

structurizr-dsl/README.md

@@ -2,7 +2,7 @@
 
 [![Maven Central](https://img.shields.io/maven-central/v/com.structurizr/structurizr-dsl.svg?label=Maven%20Central)](https://search.maven.org/artifact/com.structurizr/structurizr-dsl)
 
-This GitHub repository contains an implementation of the Structurizr DSL - a way to create Structurizr software
+This library is the implementation of the Structurizr DSL - a way to create Structurizr software
 architecture models based upon the [C4 model](https://c4model.com) using a textual domain specific language (DSL).
 The Structurizr DSL has appeared on the
 [ThoughtWorks Tech Radar - Techniques - Diagrams as code](https://www.thoughtworks.com/radar/techniques/diagrams-as-code)