Release notes for v2.20.0 (#1112)

Release Notes/Release Notes v2.20.0.md

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+# .NET Driver Version 2.20.0 Release Notes
+
+This is the general availability release for the 2.20.0 version of the driver.
+
+The main new features in 2.20.0 include:
+
+* Support for MongoDB server version 7.0.0
+* Support for equality query types in Queryable Encryption GA
+* LINQ3 bug fixes and improvements
+* Serialization bug fixes and improvements
+* Logging improvements
+
+An online version of these release notes is available [here](https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.20.0.md).
+
+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%202.20.0%20ORDER%20BY%20key%20ASC).
+
+Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v2.20/).