gitignore: add vscode

Been using vscode for a while now for development and have accidentally
added the vscode dir a few times due to global adds.

Change-Id: Ib73231bc962a7917a4ee4300a28b9ebe2b0458b3
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/.gitignore b/.gitignore
index 6da54be..1a74594 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build*/
 subprojects/*
 !subprojects/*.wrap
+.vscode/