update readme with new tutorials, new Core classes

Author: rms80

README.md

@@ -2,14 +2,22 @@
 
 Open-Source (Boost-license) C# library for geometric computing. 
 
-geometry3Sharp only uses C# language features available in .NET 3.5, so it works with the Mono C# runtime used in Unity 5.x (*NOTE: you must configure Unity for this to work, see note at bottom of this file*). 
+geometry3Sharp is compatible with Unity. Set the G3_USING_UNITY Scripting Define and you will have transparent interop between g3 and Unity vector types (*see details at the very bottom of this README*). Although the library is written for C# 4.5, if you are using the .NET 3.5 Unity runtime, it will still work, just with a few missing features.
 
 Currently there is a small amount of unsafe code, however this code is only used in a few fast-buffer-copy routines, which can be deleted if you need a safe version (eg for Unity web player).
 
 [A Nuget Package is available](https://www.nuget.org/packages/geometry3Sharp). This package is updated roughly monthly from the github master branch. So, it's "more" stable. Currently this package includes .NET 4.5 and .NET Standard 2.0 dlls. If you would like others, please email and they can be added.
 
 Questions? Contact Ryan Schmidt [@rms80](http://www.twitter.com/rms80) / [gradientspace](http://www.gradientspace.com)
 
+# Projects using g3Sharp
+
+* [Gradientspace Cotangent](https://www.cotangent.io/) - 3D printing and Mesh Repair/Modeling Tool
+* [Nia Technologies NiaFit](https://niatech.org/technology/niafit/) - 3D-printed prosthetic and orthotic design
+* [OrthoVR Project](https://orthovrproject.org/) - 3D-printed lower-leg prosthetic design in VR
+* [Archform](https://www.archform.co/) - Clear Dental Aligner design/planning app
+* [Your Project Here?](rms@gradientspace.com) - *we are very excited to hear about your project!*
+
 
 # Credits
 
@@ -23,10 +31,13 @@ The **MeshSignedDistanceGrid** class was implemented based on the C++ [SDFGen](h
 
 Several tutorials for using g3Sharp have been posted on the Gradientspace blog:
 
-- [Creating meshes, Mesh File I/O, Ray/Mesh Intersection and Nearest-Point](http://www.gradientspace.com/tutorials/2017/7/20/basic-mesh-creation-with-g3sharp)
-- [Mesh Simplification with Reducer class](http://www.gradientspace.com/tutorials/2017/8/30/mesh-simplification)
-- [Voxelization/Signed Distance Fields and Marching Cubes Remeshing](http://www.gradientspace.com/tutorials/2017/11/21/signed-distance-fields-tutorial)
-
+- [Creating meshes, Mesh File I/O, Ray/Mesh Intersection and Nearest-Point](http://www.gradientspace.com/tutorials/2017/7/20/basic-mesh-creation-with-g3sharp) - Explains DMesh3 basics, StandardMeshReader, DMeshAABBTree3 ray and point queries and custom traversals
+- [Mesh Simplification with Reducer class](http://www.gradientspace.com/tutorials/2017/8/30/mesh-simplification) - Reducer class, DMesh3.CheckValidity, MeshConstraints
+- [Remeshing and Mesh Constraints](http://www.gradientspace.com/tutorials/2018/7/5/remeshing-and-constraints) - Remesher class, projection targets, MeshConstraints, Unity remeshing animations
+- [Voxelization/Signed Distance Fields and Marching Cubes Remeshing](http://www.gradientspace.com/tutorials/2017/11/21/signed-distance-fields-tutorial) - MeshSignedDistanceGrid, MarchingCubes, DenseGridTrilinearImplicit, generating 3D lattices
+- [3D Bitmaps, Minecraft Cubes, and Mesh Winding Numbers](http://www.gradientspace.com/tutorials/2017/12/14/3d-bitmaps-and-minecraft-meshes) - Bitmap3, VoxelSurfaceGenerator, DMeshAABBTree3 Mesh Winding Number, 
+- [Implicit Surface Modeling](http://www.gradientspace.com/tutorials/2018/2/20/implicit-surface-modeling) - Implicit primitives, voxel/levelset/functional booleans, offsets, and blending, lattice/lightweighting demo
+- [DMesh3: A Dynamic Indexed Triangle Mesh](http://www.gradientspace.com/tutorials/dmesh3) - deep dive into the DMesh3 class's internal data structures and operations
 
 
 # Main Classes
@@ -47,6 +58,13 @@ Several tutorials for using g3Sharp have been posted on the Gradientspace blog:
 - **IndexPriorityQueue**: min-heap priority queue for dense situations (ie small or large number of items in queue)
 - **DijkstraGraphDistance**: compute shortest-path distances between nodes in graph, from seed points. Graph is defined externally by iterators and Func's, so this class can easily be applied to many situations.
 - **SmallListSet**: efficient allocation of a large number of small lists, with initial fixed-size buffer and "spilling" into linked list.
+- **BufferUtil**: utilities for working with arrays. Math on float/double arrays, automatic conversions, byte[] conversions, compression
+- **FileSystemUtils**: utilities for filesystem stuff
+- *g3Iterators*: IEnumerable utils **ConstantItr**, **RemapItr**, IList hacks **MappedList**, **IntSequence**
+- **HashUtil**: **HashBuilder** util for constructing FNV hashes of g3 types
+- **MemoryPool**: basic object pool
+- *ProfileUtil*: code profiling utility **LocalProfiler** supports multiple timers, accumulating, etc
+- *SafeCollections*: **SafeListBuilder** multi-threaded List construction and operator-apply
 
 ## Math