add README

Author: flegastelois

README.md

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+# Treeview GLPI plugin
+
+This plugin allows you to browse through your inventory via a tree view in a panel located on the left side of the screen. 
+
+You can browse the tree of your site to see the equipment.
+
+## Contributing
+
+* Open a ticket for each bug/feature so it can be discussed
+* Follow [development guidelines](http://glpi-developer-documentation.readthedocs.io/en/latest/plugins/index.html)
+* Refer to [GitFlow](http://git-flow.readthedocs.io/) process for branching
+* Work on a new branch on your own fork
+* Open a PR that will be reviewed by a developer