Add deprecation notice

Change-Id: Ic7048453af23fb7fc27cb8df2a5d387590c22ec8
diff --git a/README.md b/README.md
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+# Imagare plugin
+
+**DEPRECATED**: This plugin is currently not maintained anymore and is looking
+for adoption.
+
+See the [documentation](src/main/resources/Documentation/about.md) for more
+information.