Add metadata for Nori

Nori is a free and open-source Android client for online tag-based image archives. https://github.com/tjg1/nori

I am the project owner of Nori and there is already an older version of Nori that was made available on F-Droid by someone else as pe.moe.nori.

That version is old, buggy and the package name of the app has since changed (it was pulled from Google Play and I intend to re-upload it under a new applicationId). This is the reason I'm uploading it as a new metadata file. (io.github.tjg1.nori.txt)

We had a discussion on IRC as to what could be done with the old metadata file (pe.moe.nori.txt). Since a new appId needs a new file, I'd prefer that the old file is moved to an archive repository. Alternatively, this version of the app could be named "Nori 2" and the old version would be kept with a note in its description saying that it's outdated, pointing to the new version of the app. I will leave this decision up to you. I have included a Provides:pe.moe.nori line in the new metadata file.

In the future, I will have to make some changes to Nori to make sure that it falls in line with the Google Play Store Developer Content Policy (or rather, is able to pass their automated checks). Rest assured that the master branch will retain full functionality and that Nori doesn't come with any explicit image sources preconfigured, so it's completely appropriate for inclusion on F-Droid.

If you would like to confirm my ownership of the project, the commit in this merge request is signed with the same GPG key as recents commits to Nori in its GitHub repository.