Add changelog

Author: markushi

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 ## Unreleased
 
+- Add support for W3C traceparent header for outgoing requests ([#4661](https://github.com/getsentry/sentry-dotnet/pull/4661))
+  This feature is disabled by default. When enabled, outgoing requests will include the W3C traceparent header.
+  ```csharp
+  SentrySdk.Init(options =>
+  {
+      // ...
+      options.PropagateTraceparent = true;
+  });
+  ```
+
+  See https://develop.sentry.dev/sdk/telemetry/traces/distributed-tracing/#w3c-trace-context-header for more details.
+
 ### Fixes
 
 - Do not allow multiple `sentry.proguard-uuid` metadata to be set in Android manifest ([#4647](https://github.com/getsentry/sentry-dotnet/pull/4647))