added logo and some badges

Author: nikololiahim

README.md

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+![GitHub release (latest by date)](https://img.shields.io/github/v/release/polystat/polystat-cli)
+![GitHub Release Date](https://img.shields.io/github/release-date/polystat/polystat-cli)
+![GitHub all releases](https://img.shields.io/github/downloads/polystat/polystat-cli/total)
 # Polystat CLI
 This repository provides an alternative implementation to [Polystat](https://github.com/polystat/polystat). This tool's objective is to extend the functionality of the original implementation. These extensions include:
 * A precise [specification](#full) for the command-line interface.