doc/apps_group_PR_model.md

## Problem
- *Description of why you made this PR*

## Solution
- *And how you fix that*

## PR Status
*Obviously, you should really check these affirmations*  
Work finished. Package_check, basic tests and upgrade from last version OK.  
Could be reviewed and tested.

## Validation
---
*Minor decision*
- [ ] **Upgrade previous version** : 
- [ ] **Code review** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **CI succeeded** : [![Build Status](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/badge/icon)](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/) *Please replace APP and BRANCH in this link*  
When the PR is mark as ready to merge, you have to wait for 3 days before really merge it.

*Medium decision*
- [ ] **Complete test** : 
- [ ] **Upgrade previous version** : 
- [ ] **Code review** : 
- [ ] **Code review** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **CI succeeded** : [![Build Status](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/badge/icon)](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/) *Please replace APP and BRANCH in this link*  
When the PR is mark as ready to merge, you have to wait for 7 days before really merge it.

*Major decision*
- [ ] **Complete test** : 
- [ ] **Complete test** : 
- [ ] **Upgrade previous version** : 
- [ ] **Upgrade previous version** : 
- [ ] **Code review** : 
- [ ] **Code review** : 
- [ ] **Code review** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **Approval (LGTM)** : 
- [ ] **CI succeeded** : [![Build Status](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/badge/icon)](https://ci-apps-dev.yunohost.org/jenkins/job/APP_ynh%20BRANCH%20(Official)/) *Please replace APP and BRANCH in this link*  
When the PR is mark as ready to merge, you have to wait for 7 days before really merge it.