Small package to mark org-agenda conflicts

[org-agenda-conflict](https://github.com/rougier/org-agenda-conflict) allows to mark conflicting items in the org agenda. Conflicting items are items with an overlap between their start and end date. The marking assumed that items are sorted and only checks for conflicts between two consecutive lines. It can probably be extended to check for conflicts between all items but this would slow down marking. **Example Usage** (add-hook 'org-agenda-finalize-hook '(lambda () (org-agenda-conflict-mark 'error)))

Neat stuff, I was wondering why you weren't taking advantage of `org-map-entries` until I realized that you're supposed to be running this inside an org-agenda buffer. Cool stuff. If you're interested in a visual solution to this problem [org-hyperscheduler](https://github.com/dmitrym0/org-hyperscheduler) does something similar by laying your agenda out in a web view calendar.

Is it possible to add things to the agenda that isn’t a todo? Like a meeting ?

Yes, just schedule it, or add a deadline.