add readme and license

README.md

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+![](.github/images/title-icon.jpg)
+
+# Isometric 2.5D Toolset
+
+> Make 2.5D isometric game in Unity easy!
+
+[Asset Store](https://assetstore.unity.com/packages/tools/sprite-management/isometric-2-5d-toolset-27851) |
+[Forum](https://forum.unity.com/threads/isometric-2-5d-toolset.291418/) |
+[Usage Video (Sprites)](http://www.youtube.com/watch?v=IwJ_ofKG9_Y) |
+[Usage Video (Physics)](http://www.youtube.com/watch?v=wmXhyDHXYcM) |
+[API Reference](Assets/IsoTools/Docs/API.md) |
+[Changelog](Assets/IsoTools/Docs/CHANGELOG.md)
+
+## Features
+
+- Automatic sorting 2D isometric tiles and objects
+- Sorting objects with single-tile size as well as multiple-tiles size
+- Auxiliary functions for converting isometric coordinates into screen coordinates and conversely
+- Placing and snapping of objects in the Unity editor
+- Physics support! (Colliders, Rigidbodies, Trigger and Collision events, Raycasts)
+- Helpful mouse and touch functions
+- Custom isometric tile angle, ratio and height
+- Mix 2D and 3D support
+- Full [PlayPaker](https://assetstore.unity.com/packages/tools/visual-scripting/playmaker-368) support
+
+Supports Unity 2017.4 (LTS) and newer, both Personal and Pro. Full C# source code included.
+
+Leave your rating for this Asset. It is very important for me and the development of the project :) Thank you!
+
+## Limitations
+
+- Intersection of isometric objects is not allowed
+- Parent-child related isometric objects is not allowed
+
+## Screenshots
+
+### PlayMaker Support
+![](.github/images/play-maker.gif)
+
+### Custom isometric tile angle, ratio and height
+![](.github/images/custom-isometric.gif)
+
+### Mix 2D and 3D support
+![](.github/images/mix-2d-and-3d.gif)
+
+### Preview samples
+![](.github/images/sample-1.gif)
+![](.github/images/sample-2.gif)
+![](.github/images/sample-3.gif)
+![](.github/images/sample-4.gif)
+
+## [License (MIT)](./LICENSE.md)
+
+* Samples use (CC0 1.0) sprites from [kenney.nl](http://www.kenney.nl/assets)
+* Samples use (CC BY 4.0) sprites from [dragosha.com](http://dragosha.com/free)
+* Samples use free models from [Honeti's models](https://assetstore.unity.com/packages/3d/characters/humanoids/fantasy/3-free-characters-18098)