feat: add the description to the README

Author: leodevian

changelog.d/+1f89046c.added.md

@@ -0,0 +1 @@
+Add the description to `README.md`.

template/README.md.jinja

@@ -4,7 +4,9 @@
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/{{ distribution_name }}?logo=python)](https://pypi.org/project/{{ distribution_name }}/)
 [![CI](https://img.shields.io/github/actions/workflow/status/{{ repository_path }}/ci.yaml?branch=main&logo=github&label=CI)](https://github.com/{{ repository_path }}/actions/workflows/ci.yaml)
 [![License](https://img.shields.io/github/license/{{ repository_path }})](https://github.com/{{ repository_path }}/blob/main/LICENSE)
-
+{% if description %}
+{{ description }}.
+{% endif %}
 ## Installation
 
 Install `{{ distribution_name }}` using [pip](https://pip.pypa.io/):