Update CLI.md

docs/en/CLI.md

@@ -128,6 +128,24 @@ abp update [options]
 * `--npm`: Only updates NPM packages.
 * `--nuget`: Only updates NuGet packages.
 
+### Switch to nightly build (preview) packages
+
+To switch your project to latest preview version of ABP framework, you can use this command.
+
+Usage:
+
+````bash
+abp switch-to-preview [options]
+````
+You can also switch back to stable version using:
+
+````bash
+abp switch-to-stable [options]
+````
+#### Options
+
+`--solution-path` or `-sp`: Specifies the solution (.sln) file path. If not specified, CLI tries to find a .sln file in the current directory.
+
 ### login
 
 Some features of the CLI requires to be logged in to abp.io platform. To login with your username write