Added readme

README.md

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+MODX-Mirror
+===========
+
+The Mirror plugin helps you to develop MODX websites faster. It synchronizes elements (templates, chunks, plugins and snippets) from filesystem with database and reverse.
+
+### Installation
+
+1. Download [transport package](releases).
+2. Upload archive to the `core/packages` folder of your MODX installation.
+3. Use local search for the packages at the MODX Package Management page to find and install uploaded package.