Add 2.2.4 release notes

Documentation/Release-Notes/MaxScale-2.2.4-Release-Notes.md

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+# MariaDB MaxScale 2.2.4 Release Notes -- 2018-03
+
+Release 2.2.4 is a GA release.
+
+This document describes the changes in release 2.2.4, when compared to
+release 2.2.3.
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Changed Features
+
+### Masking is stricter
+
+If a masking rule specifies the table/database in addition to the column
+name, then if a resultset does not contain table/database information, it
+is considered a match if the column name matches. Please consult the
+[documentation](../Filters/Masking.md) for details.
+
+## Dropped Features
+
+## New Features
+
+## Bug fixes
+
+## Known Issues and Limitations
+
+There are some limitations and known issues within this version of MaxScale.
+For more information, please refer to the [Limitations](../About/Limitations.md) document.
+
+## Packaging
+
+RPM and Debian packages are provided for the Linux distributions supported
+by MariaDB Enterprise.
+
+Packages can be downloaded [here](https://mariadb.com/resources/downloads).
+
+## Source Code
+
+The source code of MaxScale is tagged at GitHub with a tag, which is identical
+with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
+is X.Y.Z. Further, *master* always refers to the latest released non-beta version.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).