Update README.md, introduce INSTALL.md

[pmoscode]

Description

This PR updates updates content in the "Developer documentation" section and introduces INSTALL.md.
This file describes the actions needed, to just run MIW. Nothing else.

Beside that main purpose of the PR, there are some minor adjustments / fixes, which popped up during the verification of the README.md file.

This PR fixes #150

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files

[pmoscode]

@DominikPinsel @borisrizov-zf @mknoopvw
It would be great, if you could verify the INSTALL.md.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[mknoopvw]

I tested the changes made in order to get started: it worked as described in install.md.

[github-actions]

🎉 This PR is included in version 0.2.0-develop.8 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 0.3.0-develop.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 0.3.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[carslen]

References to catenax-ng is prohibited. INSTALL.md is supposed to contain deployment information for productive use, not local test installations.

[pmoscode]

1. The reference is gone in the current release (0.3.0)
2. The installation instructions for the Helm Chart - in my opinion that would be the productive deployment - are in the Helm Chart itself. So what should be there if not the local installation? If so, then a link to it would be enough and could be placed in the Readme.md. The Install.md would then be unnecessary...