Create Participatorio-desktop theme's structure

Create Participatorio-desktop theme's structure based on Mirage xmlui theme.

dspace/modules/xmlui/src/main/webapp/themes/Participatorio-desktop/images/authority_control/confidence/readme.txt

+====
+    The contents of this file are subject to the license and copyright
+    detailed in the LICENSE and NOTICE files at the root of the source
+    tree and available online at
+
+    http://www.dspace.org/license/
+====
+16x16 Free Application Icons
+
+This icon set is free for use in personal and commercial projects.
+
+License Agreement
+
+By purchasing icons from Aha-Soft, You (the purchaser)
+agree to the terms of this agreement, as detailed below. 
+
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+
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+
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+
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+
+Icon Design Service
+
+We can design custom icons for you. Please find the basic information
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