Add Bazel files to support Bazel integration

BUILD

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+# Added BUILD file in the kubernetes c client repository helps integrating the library to external Bazel users.
+# Following are the changes required from the external Bazel users to do.
+
+# WORKSPACE
+
+# load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+# http_archive(
+#     name = "rules_foreign_cc",
+#     sha256 = "a2e6fb56e649c1ee79703e99aa0c9d13c6cc53c8d7a0cbb8797ab2888bbc99a3",
+#     strip_prefix = "rules_foreign_cc-0.12.0",
+#     url = "https://github.com/bazelbuild/rules_foreign_cc/releases/download/0.12.0/rules_foreign_cc-0.12.0.tar.gz",
+# )
+
+# load("@rules_foreign_cc//foreign_cc:repositories.bzl", "rules_foreign_cc_dependencies")
+
+# # This sets up some common toolchains for building targets. For more details, please see
+# # https://bazelbuild.github.io/rules_foreign_cc/0.12.0/flatten.html#rules_foreign_cc_dependencies
+# rules_foreign_cc_dependencies()
+
+# load("@bazel_features//:deps.bzl", "bazel_features_deps")
+
+# bazel_features_deps()
+
+# http_archive(
+#     name = "kubernetes_c_client",
+#     sha256 = "10d0c5af1a52a1d2da379e8e45b53978b9dedc90ff195bdff171ae17c1f1dd50",
+#     strip_prefix = "c-0.11.0",
+#     url = "https://github.com/kubernetes-client/c/archive/refs/tags/v0.11.0.zip",
+# )
+
+# BUILD file:
+
+# load("@rules_cc//cc:defs.bzl", "cc_binary")
+# load("@rules_foreign_cc//foreign_cc:defs.bzl", "cmake")
+# load("@rules_foreign_cc//foreign_cc:defs.bzl", "make")
+# cmake(
+#     name = "kube_c",
+#     build_args = [
+#         "--verbose",
+#         "--",  # <- Pass remaining options to the native tool.
+#         "-j 1",
+#     ],
+#     lib_source = "@kubernetes_c_client//:kubernetes",
+#     out_shared_libs = ["libkubernetes.so"],
+# )
+
+# cc_binary(
+#     name = "create_pod",
+#     srcs = ["create_pod.c"],
+#     deps = [":kube_c"],
+# )
+
+# cc_binary(
+#     name = "list_pod",
+#     srcs = ["list_pod.c"],
+#     deps = [":kube_c"],
+# )
+
+# Make sure you install the pre-requisites (libyaml,libwebsocket etc.) beforehand. A working example can be found here https://github.com/joyanta55/kubernetes_c_bazel/tree/main
+
+# In summary, the below filegroup allows to import kubernetes C client (i.e. lib_source = "@kubernetes_c_client//:kubernetes"), use cmake or make bazel rule provided by rules_foreign_cc (https://github.com/bazel-contrib/rules_foreign_cc) to build and use.
+filegroup(
+    name = "kubernetes",
+    srcs = glob(["kubernetes/**"]),
+    visibility = ["//visibility:public"],
+)