Add basic readme

so that the repo does not look naked.

README.md

@@ -0,0 +1,18 @@
+# StackRox Konflux tasks
+
+This repo provides shared Tekton tasks to build ACS/StackRox product in Konflux.
+
+Tasks themselves are in `tasks/` directory.
+
+`.tekton/` directory has the pipeline to package and push tasks as Tekton bundle OCI image for use in pipelines.
+
+## Development
+
+For as long as there are no automated tests ([ROX-27386](https://issues.redhat.com/browse/ROX-27386) is to add them), you should open PRs in consuming repos when changing tasks in order to validate your changes.
+
+Make sure you update bundle references in your consuming pipelines to the value returned in `BUNDLE_REFERENCE` parameter from the pipeline here (which builds this tasks bundle).
+
+Consuming repos are:
+* <https://github.com/stackrox/stackrox>
+* <https://github.com/stackrox/collector>
+* <https://github.com/stackrox/scanner>