feat(aws): send notifications to slack channels

knowledge base/cloud computing/aws/chatbot.md

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+# Chatbot
+
+Enables using messaging program chat rooms to monitor, and respond to, operational events in AWS by processing service
+notifications from SNS and forwarding them to chat rooms like Slack channels.
+
+One can also run AWS CLI commands in chat channels using Chatbot.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+Chatbot has **no** additional charge, minimum fees nor upfront commitments.<br/>
+One will pay for the underlying services (SNS, SQS, CloudWatch, …).
+
+Supports Amazon Chime, Microsoft Teams, and [Slack] at the time of writing.
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+# List Slack workspaces.
+aws chatbot describe-slack-workspaces
+aws chatbot describe-slack-workspaces --query 'SlackWorkspaces'
+
+# Show Slack channel configurations.
+aws chatbot describe-slack-channel-configurations
+aws chatbot describe-slack-channel-configurations --query 'SlackChannelConfigurations'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Documentation]
+- [Slack]
+- [SNS]
+
+### Sources
+
+- [What is AWS Chatbot?]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[slack]: ../../slack.md
+[sns]: sns.md
+
+<!-- Files -->
+<!-- Upstream -->
+[documentation]: https://docs.aws.amazon.com/chatbot/
+[website]: https://aws.amazon.com/chatbot/
+[what is aws chatbot?]: https://docs.aws.amazon.com/chatbot/latest/adminguide/what-is.html
+
+<!-- Others -->