Better readme

[Kr0nox]

Improve readme by adding

• [ ] a small description on what this project is
• [ ] a disclaimer that this is not an official product (similar to https://github.com/NamelessGroup/MaistaWerk/blob/c46b1e3c10388689c17f3b63f554348b8a9938b1/website/src/components/SideBarComponent.vue#L82)
  • should explain in more detail what the limits are and what does not get checked
• [ ] Logo
• [ ] Setup guide for the website