for folder, index should be created automatically

[Ducasse]

Right now github does not let you access a folder with files, you can only access a file (acting as an index) inside a folder.

This task is to introduce plugin that automatically generates the file index.html for a folder. It means that given a folder containing 3 pdf pdf1.pdf pdf2.pdf and pd3.pdf the system should generates the list

{
"title" : “List of Files in Folder”,
"layout": "index",
“plugin”: “fileLister”,
"publishDate": "2021-02-01"
}

should produce

{
"title" : “List of Files in Folder”,
"layout": "index",
"publishDate": "2021-02-01"
}

Here is the list of files in the folder

- [pdf1.pdf](pdf1.pdf)
- [pdf2.pdf](pdf2.pdf)
- [pdf3.pdf](pdf3.pdf)