Adding README file for SpatialProcessing + SolverSurfaceMagnetism

Author: cre8ivepark

Assets/HoloToolkit-Examples/SpatialMapping/SpatialProcessingSurfaceMagnetism.md

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+# Spatial Processing + Solver Surface Magnetism example
+This example shows how to make objects smoothly align with the physical surface. For more information about Solver system, please read 
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+## How to use 
+You need to assign same Unity layer to the Spatial mapping’s plane and Solver Surface Magnetism’s Magnetic Surface.
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+1. Add a new layer for the planes created by Spatial Processing. (to snap to) This example shows a new layer named ‘SpatialProcessingPlane’
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+2. In SpatialMapping prefab, change Physics Layer to the new layer number. In this example, the new layer is 8
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+3. Assign SolverSurfaceMagnetism script to an object. In Magnetic Surface option, select the new layer (SpatialProcessingPlane) that you created. 
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+4. After initial room scanning, you will be able to see MRTK logo plane is smoothly snapping to the surfaces.
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