Update readme files (#1366)

Author: josefpihrt

README.md

@@ -2,11 +2,15 @@
 
 Roslynator is a set of code analysis tools for C#, powered by [Roslyn](https://github.com/dotnet/roslyn).
 
+IMPORTANT: Analyzers will be removed from Roslynator IDE extensions in the next major release.
+It's recommended to use Roslynator NuGet packages (e.g. [Roslynator.Analyzers](https://www.nuget.org/packages/roslynator.analyzers)) instead.
+
 ## Tools
 
 - IDE extensions for:
   - [Visual Studio](https://marketplace.visualstudio.com/items?itemName=josefpihrt.Roslynator2022)
   - [VS Code](https://marketplace.visualstudio.com/items?itemName=josefpihrt-vscode.roslynator)
+    - Prerequisite is to use OmniSharp. Otherwise (i.e. C# Dev Kit), use NuGet packages with analyzers, refactorings and code fixes.
   - [Open VSX](https://open-vsx.org/extension/josefpihrt-vscode/roslynator)
 - [NuGet packages](#nuget-packages) that contain collection of analyzers
   - [Roslynator.Analyzers](https://www.nuget.org/packages/Roslynator.Analyzers)

src/VisualStudio/Overview.md

@@ -7,6 +7,9 @@
 * [List of code fixes for CS diagnostics](https://josefpihrt.github.io/docs/roslynator/fixes)
 * [Release notes](https://github.com/dotnet/roslynator/blob/main/ChangeLog.md)
 
+IMPORTANT: Analyzers will be removed from Roslynator extension in the next major release.
+As a replacement, use Roslynator NuGet packages (e.g. [Roslynator.Analyzers](https://www.nuget.org/packages/roslynator.analyzers)).
+
 ## Donation
 
 Although Roslynator is free of charge, any [donation](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=BX85UA346VTN6) is welcome and supports further development.

src/VisualStudioCode/package/README.md

@@ -2,16 +2,25 @@
 
 A collection of 500+ [analyzers](https://josefpihrt.github.io/docs/roslynator/analyzers), [refactorings](https://josefpihrt.github.io/docs/roslynator/refactorings) and [fixes](https://josefpihrt.github.io/docs/roslynator/fixes) for C#, powered by [Roslyn](https://github.com/dotnet/roslyn).
 
-## Instructions After First Installation
+IMPORTANT: Analyzers will be removed from Roslynator for VS Code in the next major release.
+It's recommended to use Roslynator NuGet packages (e.g. [Roslynator.Analyzers](https://www.nuget.org/packages/roslynator.analyzers)) instead.
+
+## Prerequsities
+
+Prerequisite for this extension is to use OmniSharp:
 
 - Set VS Code setting `dotnet.server.useOmnisharp` to `true`
 - Disable extension **C# Dev Kit** (if installed)
 
 NOTE: After each installation, Roslynator updates `omnisharp.json` to include references to Roslynator DLLs.
 
+[C# Dev Kit](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csdevkit) currently does not support loading Roslyn features from an extension (see related [issue](https://github.com/dotnet/vscode-csharp/issues/6790)), which means that this extension won't work with C# Dev Kit.
+As an alternative, it's possible to use NuGet packages that provide [refactorings](https://www.nuget.org/packages/roslynator.refactorings)
+ and [code fixes for compiler diagnostics](https://www.nuget.org/packages/roslynator.codefixes).
+
 ## Configuration
 
-Use EditorConfig file to configure analyzers, refactoring and compiler diagnostic fixes.
+Use EditorConfig file to configure analyzers, refactorings and compiler diagnostic fixes.
 
 ```editorconfig
 # Set severity for all analyzers that are enabled by default (https://docs.microsoft.com/en-us/visualstudio/code-quality/use-roslyn-analyzers?view=vs-2022#set-rule-severity-of-multiple-analyzer-rules-at-once-in-an-editorconfig-file)