DOC: Readme: add SLOC count badge

Author: kernc

README.md

@@ -3,9 +3,10 @@
 Backtesting.py
 ==============
 [![Build Status](https://img.shields.io/github/actions/workflow/status/kernc/backtesting.py/ci.yml?branch=master&style=for-the-badge)](https://github.com/kernc/backtesting.py/actions)
-[![Code Coverage](https://img.shields.io/codecov/c/gh/kernc/backtesting.py.svg?style=for-the-badge)](https://codecov.io/gh/kernc/backtesting.py)
+[![Code Coverage](https://img.shields.io/codecov/c/gh/kernc/backtesting.py.svg?style=for-the-badge&label=Covr)](https://codecov.io/gh/kernc/backtesting.py)
+[![Source lines of code](https://img.shields.io/endpoint?url=https%3A%2F%2Fghloc.vercel.app%2Fapi%2Fkernc%2Fbacktesting.py%2Fbadge?filter=.py%26format=human&style=for-the-badge&label=SLOC&color=green)](https://ghloc.vercel.app/kernc/backtesting.py)
 [![Backtesting on PyPI](https://img.shields.io/pypi/v/backtesting.svg?color=blue&style=for-the-badge)](https://pypi.org/project/backtesting)
-[![PyPI downloads](https://img.shields.io/pypi/dd/backtesting.svg?color=skyblue&style=for-the-badge)](https://pypistats.org/packages/backtesting)
+[![PyPI downloads](https://img.shields.io/pypi/dd/backtesting.svg?style=for-the-badge&label=D/L&color=skyblue)](https://pypistats.org/packages/backtesting)
 [![Total downloads](https://img.shields.io/pepy/dt/backtesting?style=for-the-badge&label=%E2%88%91&color=skyblue)](https://pypistats.org/packages/backtesting)
 [![GitHub Sponsors](https://img.shields.io/github/sponsors/kernc?color=pink&style=for-the-badge&label=%E2%99%A5)](https://github.com/sponsors/kernc)