added missing 1.9.2 release notes file.

Release Notes/Release Notes v1.9.2.md

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+C#/.NET Driver Version 1.9.2 Release Notes
+==========================================
+
+This is a minor release which fixes some issues reported since 1.9.0 was released. It is a recommended
+upgrade for anyone using 1.9.1.
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/v1.x/Release%20Notes/Release%20Notes%20v1.9.2.md
+
+The full list of JIRA issues resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?filter=15440
+
+Documentation on the C# driver can be found at:
+
+http://www.mongodb.org/display/DOCS/CSharp+Language+Center
+http://api.mongodb.org/csharp/current/
+
+General Changes
+===============
+
+The 1.9.x releases will be the last non-bug fix release supporting .NET 3.5.
+
+The issues fixed in 1.9.2 are:
+
+
+Compatibility Changes
+---------------------
+
+There were no intentional backwards breaking changes.  If you come across any,
+please inform us as soon as possible by email dotnetdriver@mongodb.com or by reporting 
+an issue at jira.mongodb.com.