Add buck build configuration

Change-Id: I77ea564150f0ef05b1d14f6bccf62c15e7b2366a

BUCK

diff --git a/BUCK b/BUCK
new file mode 100644
index 0000000..c15f524
--- /dev/null
+++ b/BUCK
@@ -0,0 +1,8 @@
+gerrit_plugin(
+  name = 'gravatar',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/resources/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: gravatar-avatar-provider'
+  ]
+)