Update README

1. update Kamlah+ 2022 reference from arXiv link to formal link
2. add useful badges to make the repo look more formal on GitHub

.github/workflows/autotest.yml

@@ -1,4 +1,4 @@
-name: autotest namelist and old
+name: Demo simulation test
 
 on:
   push:

README.md

@@ -1,4 +1,13 @@
-This is Nbody6++GPU - Beijing version, an N-body star cluster simulation code, maintained by Rainer Spurzem (spurzem/at/nao.cas.cn) and team. 
+[![autotest status](https://github.com/nbody6ppgpu/Nbody6PPGPU-beijing/actions/workflows/autotest.yml/badge.svg)](https://github.com/nbody6ppgpu/Nbody6PPGPU-beijing/actions/workflows/autotest.yml)
+[![Paper](https://badgen.net/badge/NASA%20ads/1999PASP..111.1333A/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/1999PASP..111.1333A/abstract)
+[![Paper](https://badgen.net/badge/NASA%20ads/1999JCoAM.109..407S/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/1999JCoAM.109..407S/abstract)
+[![Paper](https://badgen.net/badge/NASA%20ads/2005MNRAS.363..293H/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/2005MNRAS.363..293H/abstract)
+[![Paper](https://badgen.net/badge/NASA%20ads/2012MNRAS.424..545N/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/2012MNRAS.424..545N/abstract)
+[![Paper](https://badgen.net/badge/NASA%20ads/2015MNRAS.450.4070W/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/2015MNRAS.450.4070W/abstract)
+[![Paper](https://badgen.net/badge/NASA%20ads/2022MNRAS.511.4060K/blue?icon=https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg)](https://ui.adsabs.harvard.edu/abs/2022MNRAS.511.4060K/abstract)
+<!-- [![Paper](https://badgen.net/badge/arXiv/0000.0000/green?icon=https://static.arxiv.org/static/browse/0.3.4/images/arxiv-logo-one-color-white.svg )](https://arxiv.org/abs/xxxxx) -->
+
+This is Nbody6++GPU - Beijing version, an N-body star cluster simulation code, maintained by Rainer Spurzem ([email protected]) and team. 
 
 The code is an offspring of Sverre Aarseth's direct N-body codes see www.sverre.com . 
 
@@ -109,7 +118,7 @@ or ask any question in [our discussion](https://github.com/nbody6ppgpu/Nbody6PPG
  - https://ui.adsabs.harvard.edu/abs/2005MNRAS.363..293H/abstract (Hurley+ on SSE/BSE, earlier references therein)
  - https://ui.adsabs.harvard.edu/abs/2012MNRAS.424..545N/abstract (Nitadori+: NBODY6GPU)
  - https://ui.adsabs.harvard.edu/abs/2015MNRAS.450.4070W/abstract (Wang+: NBODY6++GPU)
- - https://ui.adsabs.harvard.edu/abs/2021arXiv210508067K/abstract (Kamlah+: More on current stellar evol.)
+ - https://ui.adsabs.harvard.edu/abs/2022MNRAS.511.4060K/abstract (Kamlah+: More on current stellar evol.)
 
 # For contributors
 ```git clone -b dev [email protected]:nbody6ppgpu/Nbody6PPGPU-beijing```