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Add variance summary image

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Marcello 2021-10-27 14:05:47 +02:00
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@ -2032,6 +2032,8 @@ Generic type parameters support covariance and contravariance to provide greater
- **Contravariance**: Enables to use a more generic (less derived) type than originally specified.
- **Invariance**: it's possible to use _only_ the type originally specified; so an invariant generic type parameter is neither covariant nor contravariant.
![covariance-vs-contravariance](../../.images/dotnet_covariant_contravariant.png)
**NOTE**: annotate generic type parameters with `out` and `in` annotations to specify whether they should behave covariantly or contravariantly.
```cs