[Document] Add badges in README.md

[Mamba413]

Add some badges in the README.md file (see below). Through them, users will convince our library are well-organized.

[![Python Build](https://github.com/abess-team/abess/actions/workflows/python_test.yml/badge.svg)](https://github.com/abess-team/abess/actions/workflows/python_test.yml)
[![R Build](https://github.com/abess-team/abess/actions/workflows/r_test.yml/badge.svg)](https://github.com/abess-team/abess/actions/workflows/r_test.yml)
[![codecov](https://codecov.io/gh/abess-team/abess/branch/master/graph/badge.svg?token=LK56LHXV00)](https://codecov.io/gh/abess-team/abess)
[![docs](https://readthedocs.org/projects/abess/badge/?version=latest)](https://abess.readthedocs.io/en/latest/?badge=latest)
[![R docs](https://github.com/abess-team/abess/actions/workflows/r_website.yml/badge.svg)](https://abess-team.github.io/abess/)
[![cran](https://img.shields.io/cran/v/abess?logo=R)](https://cran.r-project.org/package=abess)
[![pypi](https://img.shields.io/pypi/v/abess?logo=Pypi)](https://pypi.org/project/abess)
[![Conda version](https://img.shields.io/conda/vn/conda-forge/abess.svg?logo=condaforge)](https://anaconda.org/conda-forge/abess)
[![pyversions](https://img.shields.io/pypi/pyversions/abess)](https://img.shields.io/pypi/pyversions/abess)
[![License](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](http://www.gnu.org/licenses/gpl-3.0)
[![Codacy Badge](https://app.codacy.com/project/badge/Grade/3f6e60a3a3e44699a033159633981b76)](https://www.codacy.com/gh/abess-team/abess/dashboard?utm_source=github.com&utm_medium=referral&utm_content=abess-team/abess&utm_campaign=Badge_Grade)
[![CodeFactor](https://www.codefactor.io/repository/github/abess-team/abess/badge)](https://www.codefactor.io/repository/github/abess-team/abess)
[![Platform](https://anaconda.org/conda-forge/abess/badges/platforms.svg)](https://anaconda.org/conda-forge/abess)
[![Downloads](https://pepy.tech/badge/abess)](https://pepy.tech/project/abess)

[Mamba413]

@bbayukari I want to informs you that our website seems fine: https://skscope.readthedocs.io/en/latest/index.html now.