Create v1.1.0.md file

Create file with new enhancements and fixes

Author: vviau

releases/v1.1.0.md

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+**Arc** version 1.1.0 is now available for download. 
+
+There have been a huge number of fixes and enhancements.
+
+## Enhancements
+* A new interface to manage users and groups security.
+* Now you can execute MDX Set Expression in the MDX plugin.
+* New plugin dedicated to the REST API.
+* New plugin to help you manage native views and subsets.
+* The Hierarchy editor has been significantly improved:
+   * Changes to the hierarchy are now immediate.
+   * Delete/Copy/Paste multiple leaf elements at the same time.
+   * Copy a list of elements from Excel, Paste into the new element input box and then click Add!
+
+## Fixes
+https://github.com/cubewise-code/arc-issues/issues?q=is%3Aissue+is%3Aclosed+milestone%3A1.1.0
+
+## Download
+https://code.cubewise.com/arc-download/