[bitnami/crossplane] docs: add README

Signed-off-by: juan131 <juan.ariza@broadcom.com>

Author: juan131

bitnami/crossplane/README.md

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+# Bitnami Secure Images Helm chart for Crossplane
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+Crossplane is a framework for building without needing to write code cloud native control planes that can orchestrate applications and infrastructure no matter where they run.
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+[Overview of Crossplane](https://www.crossplane.io/)
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+This Helm chart is only available under the [Bitnami Secure Images initiative](https://news.broadcom.com/app-dev/broadcom-introduces-bitnami-secure-images-for-production-ready-containerized-applications).