Add .gitignore file.

Former-commit-id: 6e44af05a902134aa4fe49ed68c1acc8d7788fe3 Former-commit-id: 996f1ecc47d429b173b200e5c567b351f02684b3
2018-11-16 15:01:00 -07:00 · 2018-11-16 15:01:00 -07:00 · a89a37bde9
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,3 @@
+build/*
+images/*
+.vscode/*