MLBEDSW-7271: Add license headers to md files

Add license headers to md files and to .pre-commit-config.yaml

Change-Id: Idcca39063217744f0cc52499e2486991c0734668
Signed-off-by: Raul Farkas <raul.farkas@arm.com>
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 468fa35..4f60e96 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,3 +1,19 @@
+# SPDX-FileCopyrightText: Copyright 2020-2023 Arm Limited and/or its affiliates <open-source-office@arm.com>
+
+# SPDX-License-Identifier: Apache-2.0
+
+# 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
+
+# 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.
+
 exclude: '^ethosu/vela/(tflite|ethos_u55_regs|tosa)/'
 repos:
 -   repo: https://github.com/pre-commit/mirrors-mypy