Add badges and logo to README

[Copilot]

Replaces the placeholder badge comment block in README.rst with real, adapted badges for the flexmeasures-client repo.

Badges added

• Logo — light/dark mode via HTML <picture>/<source> (RST doesn't support #gh-light-mode-only fragments)
• License → FlexMeasures/flexmeasures-client
• CI → ci.yml workflow badge
• PyPI version → flexmeasures-client package (updated from flexmeasures)
• Python → 3.9+ (bumped from 3.8+ used in the main FlexMeasures repo)
• Code style: black — unchanged
• Coverage → FlexMeasures/flexmeasures-client on Coveralls

Required configuration

• Coveralls: Connect the repo at coveralls.io and configure CI to upload coverage reports for the badge to show data.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Readme: Add badges to the readme</issue_title>
<issue_description></issue_description>

<agent_instructions>Here are the badges copied from the FlexMeasures repo we are interested in:

![FlexMeasures Logo Light](https://github.com/FlexMeasures/screenshots/blob/main/logo/flexmeasures-horizontal-color.svg#gh-light-mode-only)
![FlexMeasures Logo Dark](https://github.com/FlexMeasures/screenshots/blob/main/logo/flexmeasures-horizontal-dark.svg#gh-dark-mode-only)

[![License](https://img.shields.io/github/license/seitabv/flexmeasures?color=blue)](https://github.com/FlexMeasures/flexmeasures/blob/main/LICENSE)
![lint-and-test](https://github.com/FlexMeasures/flexmeasures/actions/workflows/lint-and-test.yml/badge.svg)
[![Pypi Version](https://img.shields.io/pypi/v/flexmeasures.svg)](https://pypi.python.org/pypi/flexmeasures)
[![](https://img.shields.io/badge/python-3.8+-blue.svg)](https://www.python.org/downloads/)
[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
[![Documentation Status](https://readthedocs.org/projects/flexmeasures/badge/?version=latest)](https://flexmeasures.readthedocs.io/en/latest/?badge=latest)
[![Coverage](https://coveralls.io/repos/github/FlexMeasures/flexmeasures/badge.svg?kill_cache=1)](https://coveralls.io/github/FlexMeasures/flexmeasures)
[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6095/badge)](https://bestpractices.coreinfrastructure.org/projects/6095)

Please adapt them for the flexmeasures-client repo where needed, and inform me with a comment on any configuration actions potentially needed from my side.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@Flix6x @copilot Go!

Here are the badges copied from the FlexMeasures repo we are interested in:

![FlexMeasures Logo Light](https://github.com/FlexMeasures/screenshots/blob/main/logo/flexmeasures-horizontal-color.svg#gh-light-mode-only)
![FlexMeasures Logo Dark](https://github.com/FlexMeasures/screenshots/blob/main/logo/flexmeasures-horizontal-dark.svg#gh-dark-mode-only)

[![License](https://img.shields.io/github/license/seitabv/flexmeasures?color=blue)](https://github.com/FlexMeasures/flexmeasures/blob/main/LICENSE)
![lint-and-test](https://github.com/FlexMeasures/flexmeasures/actions/workflows/lint-and-test.yml/badge.svg)
[![Pypi Version](https://img.shields.io/pypi/v/flexmeasures.svg)](https://pypi.python.org/pypi/flexmeasures)
[![](https://img.shields.io/badge/python-3.8+-blue.svg)](https://www.python.org/downloads/)
[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
[![Documentation Status](https://readthedocs.org/projects/flexmeasures/badge/?version=latest)](https://flexmeasures.readthedocs.io/en/latest/?badge=latest)
[![Coverage](https://coveralls.io/repos/github/FlexMeasures/flexmeasures/badge.svg?kill_cache=1)](https://coveralls.io/github/FlexMeasures/flexmeasures)
[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6095/badge)](https://bestpractices.coreinfrastructure.org/projects/6095)

Please adapt them for the flexmeasures-client repo where needed, and inform me with a comment on any configuration actions potentially needed from my side.</comment_new>

• Fixes Readme: Add badges to the readme #53

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