Update README.md

Author: Youssef1313

README.md

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 .NET Syntax Tree Visualizer, A C# ASP.NET Core app with ReactJS in front-end that shows Roslyn's syntax tree for a given source code.
 
 **Note:** This web app hasn't been deployed yet.
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+## Visual Studio already has a graph visualizer
+
+That's true. But not all developers work on Visual Studio. Some developers might be using Rider, VS Code, or whatever.
+
+## Why to inspect a syntax tree
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+- For fun, if you just want to see what's the syntax tree Roslyn is generating.
+- For writing Roslyn's analyzers and codefixes requies knowledge of how the syntax tree for the case you're inspecting looks like.