Copy over SDK changelogs to new site (#38)

Author: devalog

fern/products/sdks/overview/dotnet/changelog.mdx

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+## 0.0.9
+**`(fix):`** When an inlined request body is entirely made up of request body properties, the entire request can now be serialized as the request body.
+
+## 0.0.8
+**`(fix):`** Several bug fixes.
+
+### What's new
+- Support for arbitrary nested clients
+- Query parameter serialization
+
+### What's changed
+- Property naming for async methods
+- Properly formatted solution files
+

fern/products/sdks/overview/dotnet/changelog/2024-05-10.mdx

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+## 0.0.10
+**`(feat):`** The generated SDK now publishes GitHub Actions to build and publish the generated package to NuGet.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-15.mdx

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+## 0.0.11
+**`(feat):`** The C# generator now generates a proper `.csproj` file with version, GitHub URL, and a reference to the SDK README.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-20.mdx

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+## 0.0.13
+**`(feat):`** If a LICENSE is specified, the generator now packages the license in the .csproj file.
+
+## 0.0.12
+**`(feat):`** The C# generator now generates an `Environments.cs` file containing URLs for different environments.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-22.mdx

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+## 0.0.16
+**`(fix):`** Miscellaneous fixes.
+
+### What's been fixed
+- .csproj indentation
+- Setting X-Fern-SDK-Name to the top-level namespace
+- Passing through serializer options when serializing JSON messages
+
+## 0.0.15
+**`(fix):`** Inlined requests that are strictly bodies are JSON serializable.
+
+## 0.0.14
+**`(feat):`** The SDK now includes a `JsonEnumMemberStringEnumConverter`.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-23.mdx

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+## 0.0.18
+**`(internal):`** Generated GitHub workflows now run on dotnet-version 8.x.
+
+## 0.0.17
+**`(feat):`** Enabled nullable on all C# files.
+
+**`(feat):`** Made project compatible with .NET 6, .NET 7, and .NET 8.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-28.mdx

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+## 0.0.20
+**`(internal):`** Enum serializers are now added directly to enum declarations.
+
+**`(internal):`** OneOf serializers are now added as a core class.
+
+## 0.0.19
+**`(fix):`** Enum serializers now handle reading and writing enum string values.
+
+**`(fix):`** Non-success status code errors are now thrown with the stringified response body.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-29.mdx

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+## 0.0.21
+**`(fix):`** Array and list fields are now generated as `IEnumerable`.
+

fern/products/sdks/overview/dotnet/changelog/2024-05-31.mdx

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+## 0.0.23
+**`(feat):`** The SDK is now compatible exclusively with .NET 6. This change reflects significant code adjustments needed for .NET 4+ compatibility.
+
+## 0.0.22
+**`(feat):`** The SDK now includes support for .NET 4.
+