Add missing .gitignore for //examples/pip_parse_vendored (#947)

diff --git a/examples/pip_parse_vendored/.gitignore b/examples/pip_parse_vendored/.gitignore
new file mode 100644
index 0000000..ac51a05
--- /dev/null
+++ b/examples/pip_parse_vendored/.gitignore
@@ -0,0 +1 @@
+bazel-*