Release notes v2.30 (#1501)

Author: BorisDog

Release Notes/Release Notes v2.30.0.md

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+# .NET Driver Version 2.30.0 Release Notes
+
+This is the general availability release for the 2.30.0 version of the driver.
+Version 2.30.0 of the driver is the last scheduled 2.x release.
+Further driver develpoment will continue in 3.x versions.
+
+Version 2.30.0 does not introduce new features or bug fixes. 
+The single purpose of 2.30 is to ease the migration to 3.x by marking the public API that was removed in 3.0 as obsolete.
+
+The full list of issues resolved in this release is available at [CSHARP JIRA project](https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.30.0%20ORDER%20BY%20key%20ASC).
+
+Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v2.30/).