[docs] add conda version badge (#6576)

README.md

@@ -14,6 +14,7 @@ Light Gradient Boosting Machine
 [![License](https://img.shields.io/github/license/microsoft/lightgbm.svg)](https://github.com/microsoft/LightGBM/blob/master/LICENSE)
 [![Python Versions](https://img.shields.io/pypi/pyversions/lightgbm.svg?logo=python&logoColor=white)](https://pypi.org/project/lightgbm)
 [![PyPI Version](https://img.shields.io/pypi/v/lightgbm.svg?logo=pypi&logoColor=white)](https://pypi.org/project/lightgbm)
+[![conda Version](https://img.shields.io/conda/vn/conda-forge/lightgbm?logo=conda-forge&logoColor=white&label=conda)](https://anaconda.org/conda-forge/lightgbm)
 [![CRAN Version](https://www.r-pkg.org/badges/version/lightgbm)](https://cran.r-project.org/package=lightgbm)
 [![NuGet Version](https://img.shields.io/nuget/v/lightgbm?logo=nuget&logoColor=white)](https://www.nuget.org/packages/LightGBM)
 

python-package/README.rst

@@ -1,7 +1,7 @@
 LightGBM Python-package
 =======================
 
-|License| |Python Versions| |PyPI Version| |PyPI Downloads| |conda Downloads| |API Docs|
+|License| |Python Versions| |PyPI Version| |PyPI Downloads| |conda Version| |conda Downloads| |API Docs|
 
 Installation
 ------------
@@ -296,6 +296,8 @@ To check that a contribution to the package matches its style expectations, run
    :target: https://pypi.org/project/lightgbm
 .. |PyPI Downloads| image:: https://img.shields.io/pepy/dt/lightgbm?logo=pypi&logoColor=white&label=pypi%20downloads
    :target: https://pepy.tech/project/lightgbm
+.. |conda Version| image:: https://img.shields.io/conda/vn/conda-forge/lightgbm?logo=conda-forge&logoColor=white&label=conda
+   :target: https://anaconda.org/conda-forge/lightgbm
 .. |conda Downloads| image:: https://img.shields.io/conda/d/conda-forge/lightgbm?logo=conda-forge&logoColor=white&label=conda%20downloads
    :target: https://anaconda.org/conda-forge/lightgbm/files
 .. |API Docs| image:: https://readthedocs.org/projects/lightgbm/badge/?version=latest