Update tutorial to address user feedback

Suggestions:

- Test on all platforms (Linux, MacOS, Windows)
- Update with any specific instructions uncovered
- Add screenshots where relevant
- Add more detailed explanation of what is happening and "how things connect"
- Better cross-linking to relevant docs details to "learn more"

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#### Document Details

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* ID: 7ac57b24-45aa-e679-6ff9-5a25c369c1ff
* Version Independent ID: cc576199-b14c-a135-2291-cc48bf301b4e
* Content: [Getting Started - EF Core](https://docs.microsoft.com/en-us/ef/core/get-started/?tabs=netcore-cli)
* Content Source: [entity-framework/core/get-started/index.md](https://github.com/dotnet/EntityFramework.Docs/blob/master/entity-framework/core/get-started/index.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **avickers**