Added README

README.md

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+CONTACT IMPORTER AND EXPORTER:
+===
+
+Building the contact importer plugin for Zarafa WebApp:
+
+```
+cd /zarafa/webapp/
+ant tools
+cd /zarafa/webapp/plugins/
+git clone https://git.sprinternet.at/zarafa_webapp/contactimporter.git
+cd contactimporter
+ant deploy
+```
+
+### Usage
+Rightclick a contactfolder or contact entry to export it as vCard.
+
+Rightclick a contactfolder to import a vCard.
+
+Rightclick a vCard attachment to import it.