Quick jump: Create a project/Open existing project | Add a new file | Add an existing file | Finding your text file output/input | Finding your source files | Building your code | Running your program
VSCode doesn't have a concept of "projects" (afaik). Instead, you will Open a Folder in VSCode, and have your source code file(s) inside that folder.
Navigate to within a folder where you will store your code (or a directory that already has code) and click OK.
The code files will show up in the Explorer bar.
Go to the File drop-down menu and select the New file.
Save the file in your project folder. C++ source files must end with .cpp, .h, or .hpp.
Output text files should be generated in the same path as your source files. If making an input text file, put it in the same directory as your source files.
Your source files should be in the folder that you opened in VSCode.