Add Razor local dogfood instructions

Author: davidwengier

CONTRIBUTING.md

@@ -23,14 +23,24 @@ To **test** do the following: `npm run test` or <kbd>F5</kbd> in VS Code with th
 
 ### Using a locally developed Roslyn server
 
-https://github.com/dotnet/roslyn contains the server implementation.  Follow the instructions there to build the repo as normal.  Once built, the server executable will be located in the build output directory, typically 
+https://github.com/dotnet/roslyn contains the server implementation.  Follow the instructions there to build the repo as normal.  Once built, the server executable will be located in the build output directory, typically
 
 `$roslynRepoRoot/artifacts/bin/Microsoft.CodeAnalysis.LanguageServer/Debug/net7.0/Microsoft.CodeAnalysis.LanguageServer.exe`
 
 depending on which configuration is built.  Then, launch the extension here and change the VSCode setting `dotnet.server.path` to point to the Roslyn executable path you built above and restart the language server.
 
 If you need to debug the server, you can set the VSCode setting `dotnet.server.waitForDebugger` to true.  This will trigger a `Debugger.Launch()` on the server side as it starts.
 
+### Using a locally developed Razor server
+
+https://github.com/dotnet/razor contains the server implementation.  Follow the instructions there to build the repo as normal.  Once built, the server will be located in the build output directory, typically
+
+`$razorRepoRoot/artifacts/bin/rzls/Debug/net7.0`
+
+depending on which configuration is built.  Then, launch the extension here and change the VSCode setting `razor.languageServer.directory` to point to the Razor executable path you built above and reload the window.
+
+If you need to debug the server, you can set the VSCode setting `razor.languageServer.debug` to true.  This will trigger a `Debugger.Launch()` on the server side as it starts. You can also set `razor.trace` to `Verbose` to get more log messages in the output window
+
 ### Creating VSIXs
 
 VSIXs can be created using the gulp command `gulp vsix:release:package`.  This will create all the platform specific VSIXs that you can then install manually in VSCode.
@@ -42,4 +52,4 @@ To update the version of the roslyn server used by the extension do the followin
 2.  In the official build stage, look for the `Publish Language Server Executables` step.  In there you will see it publishing the `Microsoft.CodeAnalysis.LanguageServer` package with some version, e.g. `4.6.0-3.23158.4`.  Take note of that version number.
 3.  In the [package.json](package.json) inside the `defaults` section update the `roslyn` key to point to the version number you found above in step 2.
 4.  Build and test the change (make sure to run `gulp installDependencies` to get the new version!).  If everything looks good, submit a PR.
-    * Adding new package versions might require authentication, run with the `--interactive` flag to login.  You may need to install [azure artifacts nuget credential provider](https://github.com/microsoft/artifacts-credprovider#installation-on-windows) to run interactive authentication.
+    * Adding new package versions might require authentication, run with the `--interactive` flag to login.  You may need to install [azure artifacts nuget credential provider](https://github.com/microsoft/artifacts-credprovider#installation-on-windows) to run interactive authentication.