[TASK] Initial commit with basic product setup

Assets/Mapbox SDK/Mapbox/Unity/MeshGeneration/Data/KdTreeCollection.cs

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+namespace Mapbox.Unity.MeshGeneration
+{
+	using UnityEngine;
+	using KDTree;
+	using Mapbox.Unity.MeshGeneration.Data;
+	using System;
+
+	/// <summary>
+	/// KdTree Collection is a feature collection using KdTree mainly for distance based searchs like "find all buildings 100m around
+	/// player" or "find 10 closest buildings to this point".
+	/// KdTree structures focus on search performance so querying for features will be very fast using this collection. On the other
+	/// hand it's not good for dynamic/moving entities but we don't have such features on map so it's one of the best options for maps.
+	/// </summary>
+
+	[CreateAssetMenu(menuName = "Mapbox/Feature Collections/Kd Tree Collection")]
+	public class KdTreeCollection : FeatureCollectionBase
+	{
+		private KDTree<VectorEntity> _entities;
+		public int Count;
+
+		public override void Initialize()
+		{
+			base.Initialize();
+			_entities = new KDTree.KDTree<VectorEntity>(2);
+		}
+
+		public override void AddFeature(double[] position, VectorEntity ve)
+		{
+			_entities.AddPoint(position, ve);
+			Count = _entities.Size;
+		}
+
+		public NearestNeighbour<VectorEntity> NearestNeighbors(double[] v, int maxCount, float range)
+		{
+			return _entities.NearestNeighbors(v, maxCount, range);
+		}
+	}
+}