Added instructions to use a NTFS formated disk with both Windows and Proton on Linux.

Using-a-NTFS-disk-with-Linux-and-Windows.md

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+# Introduction
+
+These instructions cover configuring a NTFS disk containing Steam games, that was previously used in a Windows environment, to work with Proton on Linux. This allows a user to use the same files to play games on both Windows and Linux without needing to reinstall games for each operating system.
+
+Tested on Ubuntu 18.10
+
+# Configuring and Automounting the NTFS Partition
+
+## Create a Mount Point
+
+Create a mount point for your game disk:
+```
+$ sudo mkdir /media/gamedisk
+```
+
+Find your User ID and Group ID using the following commands:
+
+**User ID**
+```
+$ id -u
+```
+**Group ID**
+```
+$ id -g
+```
+
+By default, both should be `1000`
+
+## Editing fstab
+Edit your *fstab* file to mount the partition:
+```
+$ sudo nano /etc/fstab
+```
+At the bottom of the file, add the following line (changing sda1, uid, and gid to match yours):
+```
+/dev/sda2 /media/gamedisk ntfs uid=1000,gid=1000,rw,user,exec,umask=000 0 0
+```
+
+We need to reboot the computer for the changes to take affect:
+```
+$ sudo reboot
+```
+
+## Preventing NTFS Read Errors
+
+Due to the nature of NTFS, creating files/folders with characters Windows cannot read will cause disk errors (leading to games that don't launch), the most common issue is a `;` character in filenames that Proton creates on the NTFS disk.
+
+Fixing this is pretty simple. We are going to create a symlink from the `/compatdata` folder on Linux to your mounted NTFS disk.
+
+Creating the symlink:
+
+```
+$ ln -s ~/.steam/steam/steamapps/compatdata /media/gamedisk/Steam/steamapps/
+```
+
+*If the `/compatdata` folder already exists on the mounted disk BEFORE the syslink, DELETE IT!*