Update README

[vladaskorohodova]

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[DevExpressExampleBot]

Please correct the project and update this pull request by pushing a new commit.

[BUILDING ERROR]
	OUTPUT: C:\Temp\b1a1d9f1-dc90-4dd6-9a0b-db85c8803f5a\tempTestingCS\ASP.NET Core\ASP.NET Core.csproj(25,5): error MSB3030: Could not copy the file "node_modules\jquery\dist\jquery.min.js" because it was not found.
C:\Temp\b1a1d9f1-dc90-4dd6-9a0b-db85c8803f5a\tempTestingCS\ASP.NET Core\ASP.NET Core.csproj(25,5): error MSB3030: Could not copy the file "node_modules\devextreme-dist\js\dx.all.js" because it was not found.
C:\Temp\b1a1d9f1-dc90-4dd6-9a0b-db85c8803f5a\tempTestingCS\ASP.NET Core\ASP.NET Core.csproj(25,5): error MSB3030: Could not copy the file "node_modules\devextreme-dist\js\dx.aspnet.mvc.js" because it was not found.
C:\Temp\b1a1d9f1-dc90-4dd6-9a0b-db85c8803f5a\tempTestingCS\ASP.NET Core\ASP.NET Core.csproj(25,5): error MSB3030: Could not copy the file "node_modules\devextreme-aspnet-data\js\dx.aspnet.data.js" because it was not found.
C:\Temp\b1a1d9f1-dc90-4dd6-9a0b-db85c8803f5a\tempTestingCS\ASP.NET Core\ASP.NET Core.csproj(25,5): error MSB3030: Could not copy the file "node_modules\bootstrap\dist\js\bootstrap.min.js" because it was not found.

https://codecentralfarm.devexpress.devx/job/devextreme-dropdownbox-search-in-treelist_26.1.2+/4/console