[VOL-5315] Add support for tool pre-commit and repo:onf-make

.pre-commit-config.yaml
-----------------------
  o Install basic config for pre-commit tool use.

lf/transition.mk
----------------
  o Legacy mode: add deps to checkout submodule
    when repo:onf-make library makefiles are included.

lf/onf-make/makefiles/commands/pre-commit/
------------------------------------------
  o Define convenience target 'pre-commit
  o A virtualenv is installed on demand as a dependency.
  o Invoke tool pre-commit.

lf/
Makefile
.gitmodules
-----------
  o Add repo:onf-make as a git submodule.
  o Facilitate replacing local copy & paste makefiles/ with
    a refactored library equivalent.

Change-Id: Ife154010c6ff3c8f1df38c8ebbef0d3b178cb529
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..b56b7c3
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,28 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2024 Open Networking Foundation Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+# SPDX-FileCopyrightText: 2024 Open Networking Foundation Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+# Intent:
+# -----------------------------------------------------------------------
+
+##----------------##
+##---]  LINT  [---##
+##----------------##
+pre-commit
+
+# [EOF]