Add Installing Permission Manager for Pterodactyl

Installing-Permission-Manager-for-Pterodactyl.md

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+# Prerequisites
+
+For the sake of this tutorial, we will assume that Pterodactyl is already configured and installed. If this is not the case, here are some tutorials that may help you from other sources:
+- [Pterodactyl](https://pterodactyl.io/project/introduction.html)
+
+Please note that if you get a problem during a step, feel free to join our [Discord](https://discord.gg/RJ2A8yYS2m) to open a ticket.
+
+If you are missing folders, download the addon again.
+
+# Installing Pterodactyl Side
+
+## Installing Node.js and yarn
+
+Execute these commands :
+
+### Ubuntu and other Debian-based OS
+
+```bash
+curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -
+apt install -y nodejs
+```
+
+### CentOS 7
+
+```bash
+curl -sL https://rpm.nodesource.com/setup_16.x | sudo -E bash -
+sudo yum install -y nodejs yarn
+```
+
+### CentOS 8
+
+```bash
+curl -sL https://rpm.nodesource.com/setup_16.x | sudo -E bash -
+sudo dnf install -y nodejs yarn
+```
+
+## Installing dependencies
+
+In your bash shell, run these commands:
+```bash
+npm i -g yarn 
+cd /var/www/pterodactyl
+yarn install
+```
+
+## Installing the addon
+Follow the `PanelEdit_EN.txt` or the `PanelEdit_FR.txt` file contained in the ZIP file that you have downloaded.
+
+The add-on is now fully configured. You can use it perfectly.