Add SPEC 0 badge to README

Added badge for Minimum Supported Dependencies to README.

Author: twsl

project/README.md.jinja

@@ -13,6 +13,7 @@
 [![security: bandit](https://img.shields.io/badge/security-bandit-yellow.svg)](https://github.com/PyCQA/bandit)
 [![Semantic Versions](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--versions-e10079.svg)](https://{{ repository_provider }}/{{ repository_namespace }}/{{ repository_name }}/releases)
 [![Copier](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/copier-org/copier/master/img/badge/badge-grayscale-border.json)](https://github.com/copier-org/copier)
+[![SPEC 0 — Minimum Supported Dependencies](https://img.shields.io/badge/SPEC-0-green?labelColor=%23004811&color=%235CA038)](https://scientific-python.org/specs/spec-0000/)
 {% if copyright_license == "GNU GPLv3" %}[![License](https://img.shields.io/badge/license-GPLv3-blue)](LICENSE){% elif copyright_license == "MIT" %}[![License](https://img.shields.io/badge/license-MIT-blue)](LICENSE){% endif %}