Add clang-format style for project

This adds a .clang-format file for the project.

Signed-off-by: Andreas Fuchs <andreas.fuchs@infineon.com>

.clang-format

@@ -0,0 +1,16 @@
+# SPDX-FileCopyrightText: Copyright (c) 2023-2024 Infineon Technologies AG
+#
+# SPDX-License-Identifier: BSD-2-clause
+
+---
+
+BasedOnStyle: GNU
+
+IndentWidth: 4
+ColumnLimit: 100
+BreakBeforeBraces: Attach
+SpaceBeforeParens: ControlStatementsExceptControlMacros
+AlignConsecutiveMacros:
+  Enabled: true
+  AcrossEmptyLines: true
+  AcrossComments: false