Add .gitignore file

PiperOrigin-RevId: 273637007
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..94fe2a0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,34 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+# All rights reserved.
+#
+# Copyright 2019 Google LLC
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Build objects and artifacts
+bazel-bin/
+bazel-genfiles/
+bazel-out/
+bazel-testlogs/
+bazel-XNNPACK/
+bin/
+build/
+build-*/
+deps/
+lib/
+libs/
+obj/
+out/
+*.pyc
+*.pyo
+*.log
+
+# System files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db