[bitnami/elastic-*] docs: add READMEs (#88955)

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

bitnami/elastic-agent/README.md

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+# Bitnami Secure Image for Elastic Agent
+
+## What is Elastic Agent?
+
+> Elastic Agent provides an unified way to add monitoring for logs, metrics, and other types of data to a host.
+
+[Overview of Elastic Agent](https://www.elastic.co/elastic-agent)
+
+This container image 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).

bitnami/elastic-apm-server/README.md

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+# Bitnami Secure Image for Elastic APM Server
+
+## What is Elastic APM Server?
+
+> Application performance monitoring system built on the Elastic Stack that allows you to monitor software services and applications in real time.
+
+[Overview of Elastic APM Server](https://www.elastic.co/apm)
+
+This container image 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).

bitnami/elastic-cloud-on-k8s/README.md

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+# Bitnami Secure Image for Elastic Cloud on K8s
+
+## What is Elastic Cloud on K8s?
+
+> Based on the operator pattern Elastic Cloud on K8s automates the deployment, provisioning, management, and orchestration of Elasticsearch, Kibana, APM Server, Beats and more on K8s.
+
+[Overview of Elastic Cloud on K8s](https://www.elastic.co/elastic-cloud-kubernetes)
+
+This container image 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).

bitnami/elastic-elastic/README.md

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+# Bitnami Secure Image for Elastic Elasticsearch
+
+## What is Elastic Elasticsearch?
+
+> Elasticsearch is a distributed search and analytics engine part of the Elastic Stack. It is used for web search, log monitoring, and real-time analytics. Ideal for Big Data applications.
+
+[Overview of Elastic Elasticsearch](https://www.elastic.co/elasticsearch)
+
+This container image 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).

bitnami/elastic-fleet-server/README.md

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+# Bitnami Secure Image for Elastic Fleet Server
+
+## What is Elastic Fleet Server?
+
+> A separate server that communicates with the deployed Elastic Agents on the Elastic Stack.
+
+[Overview of Elastic Fleet Server](https://www.elastic.co/elastic-agent)
+
+This container image 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).

bitnami/elastic-kibana/README.md

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+# Bitnami Secure Image for Elastic Kibana
+
+## What is Elastic Kibana?
+
+> Kibana is an open source, browser based analytics and search dashboard for Elastic Stack. Kibana strives to be easy to get started with, while also being flexible and powerful.
+
+[Overview of Elastic Kibana](https://www.elastic.co/kibana)
+
+This container image 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).

bitnami/elastic-logstash/README.md

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+# Bitnami Secure Image for Elastic Logstash
+
+## What is Elastic Logstash?
+
+> Logstash is an open source data processing engine. It ingests data from multiple sources, processes it, and sends the output to final destination in real-time. It is a core component of the Elastic Stack.
+
+[Overview of Elastic Logstash](https://www.elastic.co/logstash)
+
+This container image 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).