chore: add articles for c#, HotChocolate and Svelte

radar/2022-10-12/.gitkeep

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radar/2022-10-12/csharp.md

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+---
+title: "C#"
+ring: adopt
+quadrant: "languages-and-frameworks"
+featured: true
+---
+
+C# is a statically, strongly typed and object-oriented language. 
+After PHP and several JVM languages, we also have projects with C#. We value all features of this highly developed language.

radar/2022-10-12/hotchocolate.md

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+---
+title:      "Hot Chocolate"
+ring:       assess
+quadrant:   "languages-and-frameworks"
+featured:   true
+---
+
+[Hot Chocolate](https://chillicream.com/docs/hotchocolate/v12) is an open-source GraphQL server for .NET. 
+It is compatible to many GraphQL clients and tools and is really easy to setup and use. We assess it in one of our 
+projects as an alternative to [GraphQL .NET](https://graphql-dotnet.github.io/docs/getting-started/introduction/).

radar/2022-10-12/svelte.md

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+---
+title: "Svelte"
+ring: assess
+quadrant: "languages-and-frameworks"
+featured: true
+---
+
+[Svelte](https://svelte.dev/) is neither a language nor a framework, but actually a compiler. It compiles HTML templates to specialized code that 
+manipulates the DOM directly, which may reduce the size of transferred files and give better client performance.
+
+It is surprisingly easy to work with, and we currently assess it in an internal project.