Add missing plugin.properties
diff --git a/r/org.eclipse.statet.r.doc/build.properties b/r/org.eclipse.statet.r.doc/build.properties
index 7b2fc08..a17719c 100644
--- a/r/org.eclipse.statet.r.doc/build.properties
+++ b/r/org.eclipse.statet.r.doc/build.properties
@@ -1,5 +1,6 @@
bin.includes= META-INF/,\
plugin.xml,\
+ plugin.properties,\
about.html,\
reference/,\
book.css,\
diff --git a/r/org.eclipse.statet.r.doc/plugin.properties b/r/org.eclipse.statet.r.doc/plugin.properties
new file mode 100644
index 0000000..312fb0a
--- /dev/null
+++ b/r/org.eclipse.statet.r.doc/plugin.properties
@@ -0,0 +1,14 @@
+ #=============================================================================#
+ # Copyright (c) 2021 Stephan Wahlbrink and others.
+ #
+ # This program and the accompanying materials are made available under the
+ # terms of the Eclipse Public License 2.0 which is available at
+ # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+ # which is available at https://www.apache.org/licenses/LICENSE-2.0.
+ #
+ # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+ #
+ # Contributors:
+ # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
+ #=============================================================================#
+
