LightGBM

[docs][python] add conda-forge install instructions (#3544)

* DOC: add conda-forge install instructions

* DOC: add conda-forge instructions

* DOC: fix hyperlink

* DOC: point to installation guide

* add detailed

* Update python-package/README.rst

Co-authored-by: James Lamb <jaylamb20@gmail.com>

* Update python-package/README.rst

Co-authored-by: James Lamb <jaylamb20@gmail.com>

* rm characters

* add pip install

* add :

* Update python-package/README.rst

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update python-package/README.rst

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* remove pip from header

* channel

Co-authored-by: James Lamb <jaylamb20@gmail.com>
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>