Add release file

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

release.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -eu
+
+if [ -z "$1" ]; then
+  echo "Need version as argument"
+  exit -1
+fi
+
+version="$1"
+changelog=$(awk -v version="$version" '/^## / { printit = $2 == version }; printit' CHANGELOG.md | grep -v "## $version" | sed '1{/^$/d}')
+
+printf "Changelog will be:\\n\\n%s\\n\\n" "$changelog"
+
+read -p "Are you sure to release? " -n 1 -r
+echo
+if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+  exit 0
+fi
+
+git tag -s -a "$version" -m "$changelog"
+
+git push origin "$version"