Update README.md

Author: GiggleLiu

README.md

@@ -1,5 +1,6 @@
 # UnitDiskMapping
 
+[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://queracomputing.github.io/UnitDiskMapping.jl/dev/)
 [![CI](https://github.com/QuEraComputing/UnitDiskMapping.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/QuEraComputing/UnitDiskMapping.jl/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/github/QuEraComputing/UnitDiskMapping.jl/branch/main/graph/badge.svg?token=fwlEQnQICw)](https://codecov.io/github/QuEraComputing/UnitDiskMapping.jl)
 
@@ -19,5 +20,11 @@
 pkg> add UnitDiskMapping
 ```
 
+## Usage
+
+Please check the [documentation](https://queracomputing.github.io/UnitDiskMapping.jl/dev/) or [PRXQuantum.4.010316](https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.4.010316)
+
+![](https://user-images.githubusercontent.com/6257240/198861111-4499c17d-9938-406b-8253-943b01f4633c.png)
+
 ## Supporting and Citing
 Much of the software in this ecosystem was developed as a part of an academic research project. If you would like to help support it, please star the repository. If you use our software as part of your research, teaching, or other activities, we would like to request you to cite our [work](https://arxiv.org/abs/2209.03965). The [CITATION.bib](CITATION.bib) file in the root of this repository lists the relevant papers.