added template for Bazel

Co-Authored-By: Carmi Grushko <cgrushko@users.noreply.github.com>

community/Bazel.gitignore

+# gitignore template for Bazel build system
+# website: https://bazel.build/
+
+# Ignore all bazel-* symlinks. There is no full list since this can change
+# based on the name of the directory bazel is cloned into.
+/bazel-*