Add HIV-AD project definition

[Donaim]

In v7.17 we introduced HIV-AD project code.

But we haven't updated micall/projects.json file.

Because of this, updates to QAI fail with:

Failed to load project seeds for proj1 in date1.
Traceback (most recent call last):
  File "/usr/local/share/MiCall/micall/monitor/update_qai.py", line 115, in build_conseqs
    seeds |= projects.getProjectSeeds(target_project)
  File "/usr/local/share/MiCall/micall/core/project_config.py", line 136, in getProjectSeeds
    for region in self.config['projects'][project_name]['regions']:
KeyError: 'HIV-AD'

To solve this issue, we need to update the projects.json file.