make project buildable with buck

Change-Id: Iaac9faf3436b01d3d3871a4990ea4db85d7b4836
diff --git a/BUCK b/BUCK
new file mode 100644
index 0000000..896ab88
--- /dev/null
+++ b/BUCK
@@ -0,0 +1,21 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'changemessage',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: changemessage',
+    'Gerrit-ApiType: plugin',
+    'Gerrit-ApiVersion: 2.12-SNAPSHOT',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.changemessage.Module',
+    'Gerrit-HttpModule: com.googlesource.gerrit.plugins.changemessage.HttpModule',
+  ],
+)
+
+# this is required for bucklets/tools/eclipse/project.py to work
+java_library(
+  name = 'classpath',
+  deps = [':changemessage__plugin'],
+)
+