new_contents: all_content = """filegroup(name = "all", srcs = glob(["**"]), visibility = ["//visibility:public"])"""
  
  http_archive(
      name = "rules_foreign_cc",
      strip_prefix = "rules_foreign_cc-master",
      url = "https://github.com/bazelbuild/rules_foreign_cc/archive/master.zip",
  )
  
  new_http_archive(
      name = "bazel_skylib",
      build_file_content = all_content,
      sha256 = "b5f6abe419da897b7901f90cbab08af958b97a8f3575b0d3dd062ac7ce78541f",
      strip_prefix = "bazel-skylib-0.5.0",
      type = "tar.gz",
      urls = [
          "https://github.com/bazelbuild/bazel-skylib/archive/0.5.0.tar.gz",
      ],
  )
  
subject: add workspace definitions file (#19)