Add examples project.

src/Triangle.Examples/Examples/Example6.cs

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+namespace TriangleNet.Examples
+{
+    using System.Linq;
+    using TriangleNet;
+    using TriangleNet.Geometry;
+    using TriangleNet.Meshing.Iterators;
+    using TriangleNet.Tools;
+    using TriangleNet.Topology;
+
+    /// <summary>
+    /// Boolean operation on mesh regions (intersection, difference, xor).
+    /// </summary>
+    public static class Example6
+    {
+        public static void Run() //FindRegions()
+        {
+            // Generate the input geometry.
+            var polygon = new Polygon(8, true);
+
+            // Two intersecting rectangles.
+            var A = Generate.Rectangle(0.0, 4.0, 4.0, 0.0, 1);
+            var B = Generate.Rectangle(1.0, 5.0, 3.0, 1.0, 2);
+
+            polygon.Add(A);
+            polygon.Add(B);
+
+            // Generate mesh.
+            var mesh = (Mesh)polygon.Triangulate();
+
+            // Find a seeding triangle (in this case, the point (2, 2) lies in
+            // both rectangles).
+            var seed = (new TriangleQuadTree(mesh)).Query(2.0, 2.0) as Triangle;
+
+            var iterator = new RegionIterator(mesh);
+
+            iterator.Process(seed, t => t.Label ^= 1, 1);
+            iterator.Process(seed, t => t.Label ^= 2, 2);
+
+            // At this point, all triangles will have label 1, 2 or 3 (= 1 xor 2).
+
+            // The intersection of A and B.
+            var intersection = mesh.Triangles.Where(t => t.Label == 3);
+
+            // The difference A \ B.
+            var difference = mesh.Triangles.Where(t => t.Label == 1);
+
+            // The xor of A and B.
+            var xor = mesh.Triangles.Where(t => t.Label == 1 || t.Label == 2);
+        }
+    }
+}