Add 2.1.3 release notes

Documentation/Release-Notes/MaxScale-2.1.3-Release-Notes.md

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+# MariaDB MaxScale 2.1.3 Release Notes
+
+Release 2.1.3 is a GA release.
+
+This document describes the changes in release 2.1.3, when compared to
+release [2.1.2](MaxScale-2.1.2-Release-Notes.md).
+
+If you are upgrading from release 2.0, please also read the following
+release notes:
+[2.1.2](./MaxScale-2.1.2-Release-Notes.md)
+[2.1.1](./MaxScale-2.1.1-Release-Notes.md)
+[2.1.0](./MaxScale-2.1.0-Release-Notes.md)
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Changed Features
+
+### Cache
+
+* The storage `storage_rocksdb` is no longer built by default and is
+  not included in the MariaDB MaxScale package.
+
+### Maxrows
+
+* It can now be specified whether the _maxrows_ filter should return an
+  empty resultset, an error packet or an ok packet, when the limit has
+  been reached.
+
+  Please refer to the
+  [maxrows documentation](../Filters/Maxrows.md)
+  for details.
+
+## Bug fixes
+
+[Here is a list of bugs fixed since the release of MaxScale 2.1.2.](https://jira.mariadb.org/browse/MXS-1212?jql=project%20%3D%20MXS%20AND%20issuetype%20%3D%20Bug%20AND%20resolution%20in%20(Fixed%2C%20Done)%20AND%20fixVersion%20%3D%202.1.3)
+
+* [MXS-1227](https://jira.mariadb.org/browse/MXS-1227) Nagios Plugins broken by change in output of "show monitors" in 2.1
+* [MXS-1221](https://jira.mariadb.org/browse/MXS-1221) Nagios plugin scripts does not process -S option properly
+* [MXS-1212](https://jira.mariadb.org/browse/MXS-1212) Excessive execution time when maxrows limit has been reached
+* [MXS-1202](https://jira.mariadb.org/browse/MXS-1202) maxadmin "show service" counters overflow
+* [MXS-1200](https://jira.mariadb.org/browse/MXS-1200) config file lines limited to ~1024 chars
+
+## 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).