feat(add changelog sh):

changelog.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Get the last tag
+LAST_TAG=$(git describe --tags --abbrev=0 2>/dev/null)
+
+if [ -z "$LAST_TAG" ]; then
+    echo "No tags found. Retrieving all commits."
+    LOG_RANGE="HEAD"
+else
+    echo "Generating changelog from last tag: $LAST_TAG"
+    LOG_RANGE="$LAST_TAG..HEAD"
+fi
+
+# Retrieve commit messages excluding merge commits and format them with author names and stripped email domain as nickname
+CHANGELOG=$(git log --pretty=format:"- %s by %an, @%ae)" --no-merges $LOG_RANGE | sed -E 's/@([^@]+)@([^@]+)\..*/@\1/')
+
+# Output the changelog
+if [ -n "$CHANGELOG" ]; then
+    echo "# Changelog"
+    echo "
+## Changes since $LAST_TAG"
+    echo "$CHANGELOG"
+else
+    echo "No new commits since last tag."
+fi