2.26.0 Release notes (#1345)

Release Notes/Release Notes v2.26.0.md

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+# .NET Driver Version 2.26.0 Release Notes
+
+This is the general availability release for the 2.26.0 version of the driver.
+
+The main new features in 2.26.0 include:
+
++ Support SelectMany inside Project/Select - [CSHARP-5081](https://jira.mongodb.org/browse/CSHARP-5081)
++ Support Dictionary.ContainsValue in LINQ queries - [CSHARP-2509](https://jira.mongodb.org/browse/CSHARP-2509)
++ Support string concatenation of mixed types - [CSHARP-5071](https://jira.mongodb.org/browse/CSHARP-5071)
++ Enable use of native crypto in libmongocrypt bindings - [CSHARP-4944](https://jira.mongodb.org/browse/CSHARP-4944)
++ Support serialization of Memory and ReadOnlyMemory structs - [CSHARP-4807](https://jira.mongodb.org/browse/CSHARP-4807)
++ OIDC: support for GCP Identity Provider - [CSHARP-4610](https://jira.mongodb.org/browse/CSHARP-4610)
++ Implement signing of NuGet packages - [CSHARP-5050](https://jira.mongodb.org/browse/CSHARP-5050)
++ Direct read/write retries to another mongos if possible - [CSHARP-3757](https://jira.mongodb.org/browse/CSHARP-3757)
++ Multiple 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%202.26.0%20ORDER%20BY%20key%20ASC).
+
+Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v2.26.0}/).