feat: add send_mail.sh (#21)

tools/send_mail.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -e
+
+# @describe Send a email.
+# @meta require-tools mutt
+# @option --recipient The recipient of the email.
+# @option --subject The subject of the email.
+# @option --body The body of the email.
+
+main() {
+    mutt -s "$argc_subject" "$argc_recipient" <<<"$argc_body"
+}
+
+eval "$(argc --argc-eval "$0" "$@")"
+