Add clang-format scripts (MR 3)

clang-format/ci_run.sh

+#!/bin/sh -e
+
+apk -q add clang
+
+script_dir="$(cd "$(dirname "$0")"; pwd -P)"
+"$script_dir"/clang-format.sh

clang-format/clang-format.sh

+#!/bin/sh
+
+clang-format --version
+
+# shellcheck disable=SC2046
+clang-format -i $(find . -regex '.*\.\(c\|cpp\|h\)')
+
+git diff > differences.patch
+
+if [ -s differences.patch ]; then
+    echo "C-Code formatting check failed!"
+    echo "Please make sure, the code is formatted properly!"
+    echo "Run:"
+    # shellcheck disable=SC2016
+    echo '    clang-format -i $(find . -regex '\''.*\.\(c\|cpp\|h\)'\'')'
+    echo
+    cat differences.patch
+    echo
+    rm differences.patch
+    exit 1
+else
+    echo "C-Code formatting check is sucessful!"
+    exit 0
+fi