feat(docs): add introduction for X-Plane 11

src/pages/xp11/index.mdx

@@ -1,3 +1,40 @@
+import { Callout } from 'nextra/components';
+
 # X-Plane 11
 
-This is an introduction for X-Plane 11
+X-Plane 11 is a last generation simulator from Laminar Research. This simulator will run on Linux, as well as Mac and
+Windows.
+
+## Running X-Plane 11
+
+This simulator should be able to run out of the box with minimal problems. There are two options when buying this
+simulator:
+
+<Callout type="warning" emoji="⚠️">
+    There is a newer version of X-Plane, X-Plane 12, keep in mind it may not be worth it to buy X-Plane 11 as it will
+    most likely reach the end of its life with support from addon developers soon. This guide only has information for
+    X-Plane 11 as I do not have access to X-Plane 12.
+</Callout>
+
+- [Steam](https://store.steampowered.com/app/269950/XPlane_11/)
+- [Official Website](https://www.x-plane.com/product/desktop/)
+
+## Installing Addons
+
+Installing a lot of addons for X-Plane is quite simple as this game runs natively on Linux. A lot of the installation
+is the same as Windows.
+
+### Installing Windows only Addons
+
+The only way to install addons that will only work on the Windows version of X-Plane, you will need to run X-Plane
+through Proton.
+
+<Callout type="warning" emoji="⚠️">
+    Using Proton will remove Vulkan support, running the game in OpenGL, which will lead to a performance loss and
+    therefore is not recommended!
+</Callout>
+
+Most of these addons can be installed as usual with just a simple drag and drop into the X-Plane folder. However, some
+developers use their own executable installers, like addons bought from X-Aviation.
+
+These can be installed using Wine, where you will have to select the path to your X-Plane folder.