Added release notes for .NET client 6.0 release

Author: niemyjski

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+---
+title: Exceptionless.Net 6.0.0 Released
+date: 2023-05-04
+author: Blake Niemyjski
+---
+
+We are thrilled to announce the release of version 6 of the
+[Exceptionless .NET client](https://github.com/exceptionless/Exceptionless.Net).
+Our team has been working to enhance the client's out of the box functionality
+and clear out the entire backlog of feature requests and issues!
+
+## HTTP Header support
+
+We added the ability to automatically capture available HTTP Headers when
+gathering the Request Info!
+
+![Request Info Headers](../../assets/img/news/request-info-headers.png)
+
+The headers will be displayed on the events `Request` tab.
+
+## Logging Improvements
+
+We've made changes to all our logging targets like (E.G.,
+[NLog](https://www.nuget.org/packages/Exceptionless.NLog),
+[Microsoft.Extensions.Logging](https://www.nuget.org/packages/Exceptionless.Extensions.Logging),
+[Serilog](https://www.nuget.org/packages/Serilog.Sinks.Exceptionless)) to
+automatically configure the default log level to Trace via the
+`ExceptionlessClient.Default.Configuration.SetDefaultMinLogLevel` method. This
+method controls how we process log levels until we have server side dynamic
+log levels! Now users will see logs immediately on app startup when a logging
+provider is configured.
+
+We've also updated NLog from version 4 to version 5! Bringing in many new
+enhancements to the logging provider through community contribution!
+
+## Breaking changes
+
+We had to introduce some necessary breaking changes around serialization. Rest
+assured, we've kept these breaking changes minimal and they should not effect
+anyone. For more information, please refer to the
+[upgrade guide](https://exceptionless.com/docs/clients/dotnet/upgrading/).
+
+## Upgrading
+
+Upgrading to the latest version of the Exceptionless .NET client is simple. Just
+update your [NuGet package](https://www.nuget.org/packages/Exceptionless/), and
+you're good to go. As always, our
+[documentation](https://exceptionless.com/docs/clients/dotnet/upgrading/) is
+available to help you with the upgrade process, and our support team is always
+here to answer any questions you may have.
+
+## We want to hear from you
+
+We are constantly working to improve our .NET client and provide the best error
+tracking and reporting experience for .NET developers.
+
+* [.NET Client Feedback](https://github.com/exceptionless/Exceptionless.Net/issues/new)
+* [JavaScript Client Feedback](https://github.com/exceptionless/Exceptionless.JavaScript/issues/new)
+* [Exceptionless Feedback](https://github.com/exceptionless/exceptionless/issues/new)
+
+The team at Exceptionless