added missing file capsule.h for DX11ClothDemo

Thanks to Cameron, see Issue 486.

Demos/DX11ClothDemo/capsule.h

@@ -0,0 +1,67 @@
+#include "cap.h"
+#include "cylinder.h"
+
+
+class capsule
+{
+	public:
+
+	cap topCap;
+	cap bottomCap;
+	cylinder coreCylinder;
+
+	double x_offset, y_offset, z_offset;
+	
+	int width;
+	int height;
+	bool top;
+
+	btCollisionShape *collisionShape;
+	btCollisionObject *collisionObject;
+
+	void set_collision_object(btCollisionObject* co)
+	{
+		collisionObject = co;
+		topCap.set_collision_object( co );
+		bottomCap.set_collision_object( co );
+		coreCylinder.set_collision_object( co );
+	}
+
+	void set_collision_shape(btCollisionShape* cs)
+	{
+		collisionShape = cs;
+		topCap.set_collision_shape( cs );
+		bottomCap.set_collision_shape( cs );
+		coreCylinder.set_collision_shape( cs );
+	}
+
+	void create_texture(void)
+	{
+		topCap.create_texture();
+		bottomCap.create_texture();
+		coreCylinder.create_texture();
+	}
+
+	void destroy()
+	{
+		topCap.destroy();
+		bottomCap.destroy();
+		coreCylinder.destroy();
+	}
+
+	void draw(void)
+	{
+		topCap.draw();
+		bottomCap.draw();
+		coreCylinder.draw();
+	}
+
+
+	// paddingFactor is the amount of padding to allow the capsule collider around the 
+	void create_buffers(int width_, int height_)
+	{
+		topCap.create_buffers(width_, height_, true);
+		bottomCap.create_buffers(width_, height_, false);
+		coreCylinder.create_buffers(width_, height_);
+	}
+};