add badges

README.md

@@ -5,9 +5,12 @@
 </p>
 
 [![docs](https://img.shields.io/badge/docs-stable-blue.svg)](https://yusuke-takase.github.io/grasp2alm/index.html)
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/grasp2alm)
 ![build status](https://github.com/yusuke-takase/grasp2alm/actions/workflows/test.yml/badge.svg?branch=master)
+![PyPI - Version](https://img.shields.io/pypi/v/grasp2alm)
+![PyPI - License](https://img.shields.io/pypi/l/grasp2alm)
 
-This package supports the conversion from beam data calculated using [GRASP](https://www.ticra.com/software/grasp/) for CMB experiments to spherical harmonic coefficients ($a_{lm}$) based on the [HEALPix](https://healpix.sourceforge.io/) framework.
+This package supports the conversion from beam data calculated using [GRASP](https://www.ticra.com/software/grasp/) for CMB experiments to spherical harmonic coefficients ($a_{\ell m}$) based on the [HEALPix](https://healpix.sourceforge.io/) framework.
 The code is designed based on [Beam](https://github.com/zonca/planck-levelS/tree/master/Beam), which is part of [LevelS](https://github.com/zonca/planck-levelS), the pipleline of the Planck experiment.
 
 ## Instllation
@@ -16,7 +19,7 @@ The code is designed based on [Beam](https://github.com/zonca/planck-levelS/tree
 pip install grasp2alm
 ```
 
-Or you can install from source by:
+Or you can install it from the GitHub source by:
 
 ```
 git clone https://github.com/yusuke-takase/grasp2alm