First set of minimal docs for the new Markdown server.

site/user/index.md

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+User Documentation
+==================
+
+If you want to write code that uses the Skia library, this is the place for you.
+
+The Skia graphics library can be used for drawing Text, Geometries, and Images:
+
+  * 3x3 matrices w/ perspective
+  * antialiasing, transparency, filters
+  * shaders, xfermodes, maskfilters, patheffects
+  * subpixel text
+
+Device backends for Skia currently include:
+
+  * Raster
+  * OpenGL
+  * PDF
+  * XPS
+  * Picture (for recording and then playing back into another Canvas)
+