3.1.0 Release Notes (#1566)

Release Notes/Release Notes v3.1.0.md

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+# .NET Driver Version 3.1.0 Release Notes
+
+This is the general availability release for the 3.1.0 version of the driver.
+
+The main new features in 3.1.0 include:
+
++ Support token field type and array field expressions with Atlas Search builders for equals operator - [CSHARP-4926](https://jira.mongodb.org/browse/CSHARP-4926)
++ Support `SearchIndexType` option when creating Atlas Search indexes - [CSHARP-4960](https://jira.mongodb.org/browse/CSHARP-4960)
++ Support for valid SRV hostnames with less than 3 parts - [CSHARP-5200](https://jira.mongodb.org/browse/CSHARP-5200)
++ Support for search sequential pagination - [CSHARP-5420](https://jira.mongodb.org/browse/CSHARP-5420)
++ Support for Mql methods: `Exists`, `IsMissing` and `IsNullOrMissing` in filters when possible - [CSHARP-5427](https://jira.mongodb.org/browse/CSHARP-5427)
++ Support for Exact Vector Search (ENN) - [CSHARP-5212](https://jira.mongodb.org/browse/CSHARP-5212)
++ Allow sort option to be supplied to update commands (updateOne, etc.) - [CSHARP-5201](https://jira.mongodb.org/browse/CSHARP-5201)
++ Disabled TLS renegotiation when possible - [CSHARP-2843](https://jira.mongodb.org/browse/CSHARP-2843)
++ Fix a bug in discriminator convention inheritance - [CSHARP-5349](https://jira.mongodb.org/browse/CSHARP-5349)
++ New Serializers for ImmutableArray and other immutable collections - [CSHARP-5335](https://jira.mongodb.org/browse/CSHARP-5335)
++ Minor bug fixes and improvements.
+
+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%203.1.0%20ORDER%20BY%20key%20ASC).
+
+Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v3.1/).