add example asset

examples/assets/example.ply

@@ -0,0 +1,51 @@
+ply
+comment Source: <https://courses.cs.washington.edu/courses/cse558/01sp/software/scanalyze/points.html>.
+format ascii 1.0
+element vertex 36
+property float x
+property float y
+property float z
+property float nx
+property float ny
+property float nz
+property float intensity
+property uchar red
+property uchar green
+property uchar blue
+end_header
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