chore: add commitlint git hook

.husky/commit-msg

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx commitlint --edit "\${1}"

AUTHORS

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+Notesnook is written & maintained by:
+  - Abdullah Atta <abdullahatta@streetwriters.co>
+  - Ammar Ahmed <ammarahmed6506@gmail.com>

commitlint.config.js

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+/* eslint-disable @typescript-eslint/no-var-requires */
+
+const { execSync } = require("child_process");
+const { readFileSync } = require("fs");
+
+const authorEmail = execSync(`git show -s --format='%ae' HEAD`)
+  .toString("utf-8")
+  .trim();
+
+const authors = readFileSync("AUTHORS", "utf-8");
+const isAuthor = authors.includes(`<${authorEmail}>`);
+
+module.exports = {
+  rules: {
+    "signed-off-by": [isAuthor ? 0 : 2, "always", `Signed-off-by:`]
+  }
+};