All source files that are part of the application you are developing must be added to
the project.
You can add existing files or create files in the project directory.
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To add an existing file, right-click your project or any subfolder in the
Project Explorer and select Add Existing
File. Browse to the file that you want to import and open
it.
The original file is not copied into the project, but it is included from its
original location. That means that any modifications that you do will apply to
all projects that use this file.
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To create a file, right-click your project or any subfolder in the
Project Explorer and select Add New
File.
By default, the file is created in the project directory.