document tag versioning (#40)

* Document tag versioning

Ticket: DENA-255

* Add link to `kafka-ui` with other components

Ticket: DENA-255

Author: matthewhughes-uw

README.md

@@ -9,3 +9,19 @@ This repository provides a kustomize base to deploy a kafka cluster
 - Zookeeper
 - lag-monitor
 - [mirror-maker 2](mirror-maker-2)
+- [kafka-ui](./kafka-ui)
+
+## Versioning
+
+Each component in this repo is versioned separately. These versions are managed
+by tags having three components:
+
+  - The name of the component
+  - The version of the underlying image used in the manifests
+  - An internal version to track changes to anything besides the version of the
+  image used
+
+These tags are of the form
+`<component-name>-<image-version>-<internal-version>`, for example:
+`kafka-ui-v0.7.1-1` is the first internal version of these manifests for the
+`kafka-ui` component supporting `provectuslabs/kafka-ui:v0.7.1`