Add archive notice and brief summary.

README.md

@@ -2,20 +2,11 @@
 
 [![Template](https://img.shields.io/badge/Template-LINCC%20Frameworks%20Python%20Project%20Template-brightgreen)](https://lincc-ppt.readthedocs.io/en/latest/)
 
-[![PyPI](https://img.shields.io/pypi/v/mapals?color=blue&logo=pypi&logoColor=white)](https://pypi.org/project/mapals/)
-[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/lincc-frameworks/mapals/smoke-test.yml)](https://github.com/lincc-frameworks/mapals/actions/workflows/smoke-test.yml)
-[![Codecov](https://codecov.io/gh/lincc-frameworks/mapals/branch/main/graph/badge.svg)](https://codecov.io/gh/lincc-frameworks/mapals)
-[![Read The Docs](https://img.shields.io/readthedocs/mapals)](https://mapals.readthedocs.io/)
-[![Benchmarks](https://img.shields.io/github/actions/workflow/status/lincc-frameworks/mapals/asv-main.yml?label=benchmarks)](https://lincc-frameworks.github.io/mapals/)
+GPU-accelerated Lomb-Scargle implementations.
 
-This project was automatically generated using the LINCC-Frameworks 
-[python-project-template](https://github.com/lincc-frameworks/python-project-template).
+__ARCHIVE NOTICE__
 
-A repository badge was added to show that this project uses the python-project-template, however it's up to
-you whether or not you'd like to display it!
-
-For more information about the project template see the 
-[documentation](https://lincc-ppt.readthedocs.io/en/latest/).
+__This repository is no longer being maintained.__
 
 ## Dev Guide - Getting Started