Release notes for 2.18.0.

Author: rstam

Release Notes/Release Notes v2.18.0.md

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+# .NET Driver Version 2.18.0 Release Notes
+
+This is the general availability release for the 2.18.0 version of the driver.
+
+The main new features in 2.18.0 include:
+
+* Snappy compression now uses a managed implementation
+* ZStandard compression now uses a managed implementation
+* Cache AWS credentials when possible
+* New cross driver standard logging support
+* Support for $documents aggregation pipeline stage
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/master/Release%20Notes/Release%20Notes%20v2.18.0.md
+
+The full list of JIRA issues resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.18.0%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+https://mongodb.github.io/mongo-csharp-driver/