chore(kb): convert placeholders to articles

knowledge base/cloud computing/radius.md

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+# Radius
+
+> TODO
+
+Intro
+
+<!-- Remove this line to uncomment if used
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Codebase]
+
+### Sources
+
+- [Documentation]
+- [The Microsoft Azure Incubations Team launches Radius, a new open application platform for the cloud]
+- [Radius a new open-source application platform for the cloud | BRK402]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[codebase]: https://github.com/radius-project/radius
+[documentation]: https://docs.radapp.io/
+[website]: https://radapp.io/
+
+<!-- Others -->
+[radius a new open-source application platform for the cloud | brk402]: https://www.youtube.com/watch?v=gaG77PiYv5w
+[the microsoft azure incubations team launches radius, a new open application platform for the cloud]: https://azure.microsoft.com/en-us/blog/the-microsoft-azure-incubations-team-launches-radius-a-new-open-application-platform-for-the-cloud/