Update README.md

Author: guFalcon

README.md

@@ -32,6 +32,7 @@
  ***************************************************************************/
 
 ```
+[![NuGet](https://img.shields.io/nuget/v/CollisionGrid.svg?maxAge=2592000)](https://www.nuget.org/packages/CollisionGrid/)
 
 # General  
 
@@ -154,4 +155,4 @@ The good news about the QuadTree is that it's exactly what you're looking for if
 [github]: https://github.com/UnterrainerInformatik/collisiongrid
 [quadtree]: https://github.com/ChevyRay/QuadTree
 [testrectangle]: https://github.com/UnterrainerInformatik/collisiongrid/blob/master/testrectangle.gif
-[testposition]: https://github.com/UnterrainerInformatik/collisiongrid/blob/master/testposition.gif
+[testposition]: https://github.com/UnterrainerInformatik/collisiongrid/blob/master/testposition.gif