chore(script): check message during commit

- Add script that checks message from file
- Add precommit hook to help python developers make goo commit messages

.pre-commit-hooks.yaml

@@ -0,0 +1,6 @@
+---
+- id: commit-message-validator
+  name: Commit Message Validator
+  description: Checks that commit messages are compliant with Lumapps rules.
+  entry: check_message.sh
+  language: script

check_message.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if [[ -v ZSH_NAME ]]; then
+  setopt BASH_REMATCH
+  setopt RE_MATCH_PCRE
+  setopt KSH_ARRAYS
+fi
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+source $DIR/validator.sh
+
+MESSAGE=$(<"$1")
+echo "checking commit message: '${MESSAGE}'"
+validate "$MESSAGE"
+
+echo "Message succesfully checked"