added shape_taiwan

docs/lib-shape_taiwan.md

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+# shape_taiwan
+
+Returns shape points of [Taiwan](https://www.google.com.tw/maps?q=taiwan&um=1&ie=UTF-8&sa=X&ved=0ahUKEwjai9XrqurTAhVIopQKHbEHClwQ_AUICygC). They can be used with xxx_extrude modules of dotSCAD. The shape points can be also used with the built-in polygon module. 
+
+## Parameters
+
+- `h` : The height of Taiwan.
+
+## Examples
+
+	include <shape_taiwan.scad>;
+
+	polygon(shape_taiwan(10));
+
+![shape_taiwan](images/lib-shape_taiwan-1.JPG)
+
+	include <shape_taiwan.scad>;
+	include <circle_path.scad>;
+	include <rotate_p.scad>;
+	include <golden_spiral.scad>;
+	include <cross_sections.scad>;
+	include <polysections.scad>;
+	include <golden_spiral_extrude.scad>;
+
+	mirror_taiwan = [for(pt = shape_taiwan(15)) [pt[0] * -1, pt[1]]];
+
+	golden_spiral_extrude(
+		mirror_taiwan, 
+		from = 1,  
+		to = 10, 
+		point_distance = 2.5,
+		scale = 10
+	);
+
+![shape_taiwan](images/lib-shape_taiwan-2.JPG)
+