[Parental Control] Add the screen time management

Parental Control on /e/OS allows parents to protect children from inappropriate contents. This is done by restricting access to some mobile applications and web contents, depending on the child's age. 

Parental Control on /e/OS allows parents to protect children from inappropriate contents and to limit screen usage. This is done by restricting access to some mobile applications and web contents, depending on the child's age and by defining a daily screen time limit.

## Importance of Parental Control

* Select the `Age group of the child`  and tap `Next`.   

![alt text](/images/parental-control/parental-control-activate-3.png)   

* Select a daily screen time limit and tap `Next`. If you don't want to set any screen time limit tap `Skip`

* Choose whether you want to :

    * let your kid install any app matching their age group and only approve installation of apps rated _Parental Guidance_

    * OR approve any app installation

* Toggle on the already installed apps your child is allowed to run

* Set up a `Pin` or `Password` to manage Parental Control's settings. This PIN/Password is required when changing or disabling Parental Control's settings. Your child should not know this PIN/Password.   

![alt text](/images/parental-control/parental-control-activate-4.png)   

* DNS queries are intercepted on device to deny access to adult websites and block trackers.   

* Private DNS is set to Cloudflare's family friendly DNS, and cannot be changed.   

{% include alerts/tip.html content="Cloudflare Family DNS helps keep kids safe online by:<br>

    - Blocking adult content<br>

* Private DNS is set to Mullvad DNS All and Kids DNS0 as a fall back. This setting cannot be changed.   

{% include alerts/tip.html content="Mullvad DNS All helps keep kids safe online by:<br>

    - Blocking adult, gambling and social media content<br>

    - Filtering out malware and phishing sites<br>

    - Preventing access to violent or harmful content<br>

    - Blocking ads and trackers<br>

    - Limiting access to age-inappropriate content"%}   

![alt text](/images/parental-control/private-dns-cannot-be-changed1.png) ![alt text](/images/parental-control/private-dns-cannot-be-changed2.png)

* Apps can only be installed via [App Lounge](/support-topics/app_lounge.html), which gives access to apps from Google Play and F-droid.     

![alt text](/images/parental-control/app-lounge-ss2.png) ![alt text](/images/parental-control/app-lounge-ss1.png)   

* Apps can only be installed if the app's content rating matches the child's age set during Parental Control setup. Apps' content ratings are published by Google Play or F-Droid depending on the app.   

* Apps can only be installed if the app's content rating matches the child's age set during Parental Control setup or if the parent enters the PIN/password if they decided to approve any app installation. Apps' content ratings are published by Google Play or F-Droid depending on the app.   

![alt text](/images/parental-control/age-restricted-apps-cant-install-1.png) ![alt text](/images/parental-control/age-restricted-apps-cant-install-2.png)

* Apps which require parental guidance cannot be installed for the 0-3 age group. We plan to make it customizable in the next few updates.   

* Apps which require parental guidance need the parent PIN/password to be installed

![alt text](/images/parental-control/parental-consent-required1.png) ![alt text](/images/parental-control/parental-consent-required2.png)   

* Already installed apps whose age ratings are more than the age set by parent are greyed out and cannot be launched.   

* Already installed apps whose age ratings are more than the age set by parent are toggled off and cannot be launched by default. The parent can decide to toggle on an app available for a higher age if they wish to do so.

![alt text](/images/parental-control/greyed-out.png) ![alt text](/images/parental-control/cant-open-app.png)   

* After setting up Parental Control with only one user, your child won't be able to create new users.   

## Disabling or Changing Parental Control

* To disable Parental Control, change the age group, or change the PIN/password, the parent needs to enter the PIN/password that was set during setup.   

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* To disable Parental Control, change the age group, change the screen time limit, change the app installation option, or change the PIN/password, the parent needs to enter the PIN/password that was set during setup.   

## Troubleshooting

* **Screen time management doesn't work:** Disable and configure again Parental Control feature. If you configured Parental Control before applying /e/OS 3.0, this is needed to get screen time management working.