Add badges (#159)

Author: vicentepinto98

README.md

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+[![Go Report Card](https://goreportcard.com/badge/github.com/stackitcloud/stackit-cli)](https://goreportcard.com/report/github.com/stackitcloud/stackit-cli) ![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/stackitcloud/stackit-cli) [![GitHub License](https://img.shields.io/github/license/stackitcloud/stackit-cli)](https://www.apache.org/licenses/LICENSE-2.0)
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 # STACKIT CLI (BETA)
 
 Welcome to the [STACKIT](https://www.stackit.de/en) CLI, a command-line interface for the STACKIT services.