Add `About` page

Add an About page, which explains how, why and by whom this app was built.
Things to mention:
- [Philosophy](https://github.com/Tch1b0/myDSB#philosophy)
- [Github Repo](https://github.com/Tch1b0/myDSB)
- [Technology used](https://github.com/Tch1b0/myDSB#built-with)
- [Contributors](https://github.com/tch1b0/myDSB/graphs/contributors)
- [heineking**media**](https://heinekingmedia.de/) & [DSBmobile](https://www.dsbmobile.de/Login.aspx)

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Add `About` page #41

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Add About page #41

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Add `About` page #41