chore: add setup scripts

Added setup scripts for commit message template and reference to them in
README.

scripts/setup.ps1

@@ -0,0 +1,17 @@
+#!/usr/bin/env pwsh
+
+# Copyright 2026 Seekra
+
+# 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.
+
+git config --local commit.template .gitmessage