Missing detection for creating new files

[darkred]

Per refined-github/refined-github#4252 (comment)

In the PR above I want to match patterns of both these URL examples:

- Create new file:         https://github.com/sindresorhus/refined-github/new/main
- Modify an existing file: https://github.com/sindresorhus/refined-github/edit/main/readme.md

Checking them via https://fregante.github.io/github-url-detection/ I see that :

So I have in the PR the following:

	include: [
		...
		pageDetect.isRepo,
		pageDetect.isEditingFile
	],

But, as mentioned by @yakov116:

Adding isRepo will add it to all repo pages (PR's Issues etc)

[yakov116]

Maybe it should be a new option isCreatingNewFile ?

[fregante]

isNewFile 👍

[darkred]

I made PR #70