WebComp - Project Structure

**Describe the solution you'd like**
The file structure and important files of the webcomp-template should be documented and described.
A table-based documentation which short information about the purpose of folders and files must be created.

Start by inspecting the webcomp-template file structure and identifying its folders and important files. Create table-based documentation describing the purpose of each folder and file; done means the structure and brief descriptions are documented.

Written by the indexing model from the issue text.