Release notes for 2.16.0.

Author: rstam

Release Notes/Release Notes v2.16.0.md

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+# .NET Driver Version 2.16.0 Release Notes
+
+This is the general availability release for the 2.16.0 version of the driver.
+
+The main new features in 2.16.0 include:
+
+* Support for MongoDB server version 6.0.0
+* [BETA] Support for Queryable Encryption
+* Support for creating collections with clustered indexes
+* Use `count` command for `estimatedDocumentCount`
+* LINQ3 bug fixes and improvements
+* Support for carry forward (`$locf`) and numerical/date densification (`$densify`)
+* Support for `limit` in `$filter` expressions
+* Support point-in-time pre-/post-images in change streams
+* Preemptively cancel in-progress operations when SDAM heartbeats timeout
+
+### EstimatedDocumentCount and Stable API
+
+`EstimatedDocumentCount` is implemented using the `count` server command. Due to an oversight in versions
+5.0.0-5.0.8 of MongoDB, the `count` command, which `EstimatedDocumentCount` uses in its implementation,
+was not included in v1 of the Stable API. If you are using the Stable API with `EstimatedDocumentCount`,
+you must upgrade to server version 5.0.9+ or set `strict: false` when configuring `ServerApi` to avoid
+encountering errors.
+
+For more information about the Stable API see:
+
+https://mongodb.github.io/mongo-csharp-driver/2.16/reference/driver/stable_api/
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.16.0.md
+
+The full list of JIRA issues resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.16.0%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+https://mongodb.github.io/mongo-csharp-driver/
+