Bazel: add .gitignore.

Change-Id: Iad3f24d03ea899d6b356b1a07711bc8d72bc447e
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
Reviewed-on: https://nginx-review.googlesource.com/c/nginx/+/3647
Reviewed-by: Daniel Berkovitch <dbrk@google.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..725f2b2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/bazel-*
+/objs/
+/Makefile