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docs: update README.md (#43)
Add `Getting Started` and `Examples` section
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README.md

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[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=Testably_Testably.Abstractions.FluentAssertions&branch=main&metric=coverage)](https://sonarcloud.io/summary/overall?id=Testably_Testably.Abstractions.FluentAssertions&branch=main)
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This library is an extension to [FluentAssertions](https://github.com/fluentassertions/fluentassertions) for the `IFileSystem` interface from [Testably.Abstractions](https://github.com/Testably/Testably.Abstractions).
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This library is an extension to [FluentAssertions](https://github.com/fluentassertions/fluentassertions) for the [`IFileSystem` interface](https://github.com/TestableIO/System.IO.Abstractions).
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## Getting Started
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- Install `Testably.Abstractions.FluentAssertions` as nuget package.
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```ps
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dotnet add package Testably.Abstractions.FluentAssertions
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```
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- Add the following `using` statement:
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```csharp
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using Testably.Abstractions.FluentAssertions;
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```
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This brings the extension methods in the current scope.
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## Examples
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1. Verify, that a directory "foo" exists under the current directory in the file system:
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```csharp
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fileSystem.Should().HaveDirectory("foo");
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```
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or
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```csharp
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IDirectoryInfo directoryInfo = fileSystem.DirectoryInfo.New(".");
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directoryInfo.Should().HaveSingleDirectory("foo");
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```
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3. Verify, that the file "foo.txt" has text content "bar":
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```csharp
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fileSystem.Should().HaveFile("foo.txt")
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.Which.HasContent("bar");
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```

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