2.27.0 Release notes (#1372)

Release Notes/Release Notes v2.27.0.md

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+# .NET Driver Version 2.27.0 Release Notes
+
+This is the general availability release for the 2.27.0 version of the driver.
+
+The main new features in 2.27.0 include:
+
++ Support $sample aggregation operator - [CSHARP-2659](https://jira.mongodb.org/browse/CSHARP-2659)
++ Implement Equals method for serializers in LINQ3 - [CSHARP-3315](https://jira.mongodb.org/browse/CSHARP-3315)
++ Avoid Appending Write/Read Concern in Atlas Search Index Helper Commands - [CSHARP-4839](https://jira.mongodb.org/browse/CSHARP-4839)
++ Disallow comma character in authMechanismProperties connection string value - [CSHARP-5106](https://jira.mongodb.org/browse/CSHARP-5106)
++ Fix translation issue during serialization of numbers with differing sizes - [CSHARP-5163](https://jira.mongodb.org/browse/CSHARP-5163)
++ Support Linux distros using libdl.so.2 [CSHARP-4889](https://jira.mongodb.org/browse/CSHARP-4889)
++ 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%202.27.0%20ORDER%20BY%20key%20ASC).
+
+Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v2.27/).