Add an example WebComponent.

Change-Id: I74a6b63912f431db150e6cd4707c405621a922dd
diff --git a/.gitignore b/.gitignore
index bd7fe11..01163f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,6 @@
 # Maven
 target/
 *.versionsBackup
+
+# Yarn
+node_modules