docs: add introduction

Signed-off-by: nscuro <[email protected]>

README.md

@@ -6,6 +6,22 @@
 
 *Go client library for [OWASP Dependency-Track](https://dependencytrack.org/)*
 
+## Introduction
+
+*client-go* is a Go library to interact with Dependency-Track's REST API, making it easy to implement
+custom automation around Dependency-Track.
+
+Example use-cases include:
+
+* Interacting with Dependency-Track in CI/CD pipelines
+  * e.g. to implement quality gates, or generate build reports
+* Uploading BOMs of various origins
+  * e.g. from all containers running in a Kubernetes cluster, see [sbom-operator](https://github.com/ckotzbauer/sbom-operator)
+* Reacting to Webhook notifications
+  * e.g. to automate analysis decisions on findings, see [dtapac](https://github.com/nscuro/dtapac)
+* Reporting and tracking of portfolio metrics in specialized systems
+  * e.g. to expose metrics to time-series databases like Prometheus, see [dependency-track-exporter](https://github.com/jetstack/dependency-track-exporter)
+
 ## Installation
 
 ```