Release notes for 2.13.0.

Author: rstam

Release Notes/Release Notes v2.13.0.md

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+# .NET Driver Version 2.13.0 Release Notes
+
+This is the general availability release for the 2.13.0 version of the driver.
+
+The main new features in 2.13.0 include:
+
+* Load-balanced mode for Atlas Serverless
+* Versioned MongoDB API for Drivers
+* Implemented change stream oplog parsing code for delta oplog entries
+* Snapshot reads on secondaries
+* Support for creating time-series collections
+* Permit dots and dollars in field names
+* Improved error messages from document validation
+* Better ExpandoObject support
+* `estimatedDocumentCount()` now uses the `$collStats` aggregation stage instead of the `count` command
+* Reduced lock contention in BsonSerializer.LookupActualType
+* `slaveOk` connection string option removed; use `readPreference` instead
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.13.0.md
+
+The full list of JIRA issues that are resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.13.0%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+https://docs.mongodb.com/drivers/csharp/
+