Add method to make easier to add terms to post

[jgrossi]

This PR adds a addTerm(string $taxonomy, string $term) method to the Post model.

It partially fixes issue #410.

This way you don't have to worry about relations when adding terms to a given post:

$post = Post::find(1);
$term_instance = $post->addTerm('foo', 'Foo Term'); // "Foo Term" slug would be "foo-term"

🔥😎

[kushsharma]

Hi, can you pull this up? @jgrossi
The code looks fine other than a merge conflict as those helpers would be really useful.

[jgrossi]

hey @kushsharma gonna try to fix conflicts today or tomorrow, merge it and release a new version. probably gonna change the repo from 2.7 to 2.8, the current one. cheers

[gumbophp]

any updates on this?

[marcpre]

Any update on this method?

[gumbophp]

So why is this still pending
1 year ago I really needed this functionality into corcel
If anything I can fork it and fix the things.