Add .vscode to polygerrit-ui/.gitignore

Change-Id: I6e2b70d11068d1288dc6de85c3d99648c8aac6fc
diff --git a/polygerrit-ui/.gitignore b/polygerrit-ui/.gitignore
index b3b74a6..7f06bef 100644
--- a/polygerrit-ui/.gitignore
+++ b/polygerrit-ui/.gitignore
@@ -4,3 +4,4 @@
 fonts
 bower_components
 .tmp
+.vscode
\ No newline at end of file