Add tool pre-commit to suport source linting.

Makefile
requirements.txt
.pre-commit-config.yaml
-----------------------
  o Add project copyright notice with SPDX tokens.
  o Added makefile targets for installing a virtualenv and the
    tool/library pre-commit.
  o .pre-commit-config added for basic linting config.

Change-Id: Ib225221e1db149715d015a71877655299657d6a7
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
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]