Merge pull request #2654 from StephenHodgson/vNEXT-ControllerIcons

Added Oculus Controller Icons

Author: keveleigh

Assets/MixedRealityToolkit/_Core/Resources/Textures/Oculus lineart attribution.txt

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+You may use these images solely for referring to the corresponding product in your video game or VR experience (including manuals for users). Otherwise, you may not use these images, or any Oculus trademarks, logos or other intellectual property, including but not limited to use on merchandise or other product such as clothing, hats, or mugs. Do not use the Oculus images in a way that implies a partnership, sponsorship or endorsement; or features Oculus on materials associated with pornography, illegal activities, or other materials that violate Oculus Terms.
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+THE IMAGES ARE PROVIDED TO YOU ON AN �AS IS� BASIS AND YOU ARE SOLELY RESPONSIBLE FOR YOUR USE OF THE IMAGES. OCULUS DISCLAIMS ALL WARRANTIES REGARDING THE IMAGES, INCLUDING WARRANTIES OF NON-INFRINGEMENT. OCULUS SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR PUNITIVE DAMAGES ARISING FROM OR RELATED TO YOUR USE OF THE IMAGES.
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+For the avoidance of doubt, this license shall not apply to the Oculus name, trademark or service mark, logo or design.