README: Add Run tests and upload coverage status button (brisbanesocialchess#700)

* README: Add `Run tests and upload coverage` status button

* style: format code with Black, isort and Prettier

This commit fixes the style issues introduced in eeb32b3 according to the output
from Black, isort and Prettier.

Details: brisbanesocialchess#700

---------

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

Author: jbampton

README.md

@@ -66,6 +66,7 @@ This site is built using [Eleventy (11ty)](https://www.11ty.dev/), a modern and
 [![Pull Request Labeler](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/labeler.yml/badge.svg)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/labeler.yml)
 [![Lerna](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/lerna.yml/badge.svg?branch=main)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/lerna.yml)
 [![pre-commit](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/pre-commit.yml/badge.svg?branch=main)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/pre-commit.yml)
+[![Run tests and upload coverage](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/coverage.yml/badge.svg?branch=main)](https://github.com/brisbanesocialchess/brisbanesocialchess.github.io/actions/workflows/coverage.yml)
 
 - **Live site:** [https://www.brisbanesocialchess.org.au/](https://www.brisbanesocialchess.org.au/)
 - **GitHub Pages:** Current development site [https://brisbanesocialchess.github.io/](https://brisbanesocialchess.github.io/)