Added a README

README.md

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+# OrbiterSteamController
+
+## Intro
+
+I love the Steam Controller, however it presents itself to the running process directly as an xinput controller. Unfortunately this means Orbiter can't detect it during launch.
+
+This plugin detects the xinput controller presented by the Steam Controller and maps the analog inputs to the flight control surfaces.
+
+## Install
+
+Unzip the contents into your Orbiter install directory.
+
+## Setup
+
+1. Enable OrbiterSteamController in the Orbiter _Modules_ menu
+2. Add Orbiter as a non-Steam game
+3. Configure the controller in the Steam Overlay
+    * Configure the analog stick as _Joystick Move_ with Output set to _Left Joystick_
+    * For the left and right triggers, configure the Trigger Analog Output as _Left Trigger_ and _Right Trigger_ respectively and disable Full Pull and Soft Pull Actions
+
+## Use
+
+The analog stick will now control pitch and roll. The left and right triggers will control yaw.
+
+## Additional Tips
+
+* Outside of the analog functions, you can configure almost everything else directly in the Steam Overlay by mapping keys to the Steam Controller.
+* You can configure one of the pads as a mouse with a _Touch Binding_ of "RIGHT MOUSE" - and a click action of the _HOME_ key. This will give you a nice touchpad for changing your view, looking around in the cockpit.