Added release notes from other branches.

Release Notes/Release Notes v2.6.0.md

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+# .NET Driver Version 2.6.0 Release Notes
+
+The main new feature of 2.6.0 is better support for running when FIPS mode is enabled in the operating system.
+
+* GridFS now has an option to disable MD5 checksum computation
+* PasswordEvidence has been refactored to no longer use MD5
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/v2.6.x/Release%20Notes/Release%20Notes%20v2.6.0.md
+
+The JIRA tickets resolved in this release is available at:
+
+https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%202.6.0%20ORDER%20BY%20key%20ASC
+
+Upgrading
+
+We believe there are only minor breaking changes in classes that normally would not be directly used by applications.

Release Notes/Release Notes v2.6.1.md

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+# .NET Driver Version 2.6.1 Release Notes
+
+This is a patch release that fixes a few bugs reported since 2.6.0 was released.
+
+An online version of these release notes is available at:
+
+https://github.com/mongodb/mongo-csharp-driver/blob/v2.6.x/Release%20Notes/Release%20Notes%20v2.6.1.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%202.6.1%20ORDER%20BY%20key%20ASC
+
+Documentation on the .NET driver can be found at:
+
+http://mongodb.github.io/mongo-csharp-driver/
+
+Upgrading
+
+There are no known backwards breaking changes in this release.