listing typescript port

Author: velipso

README.md

@@ -24,6 +24,7 @@ Boolean operations on polygons (union, intersection, difference, xor).
 
 Other kind souls have ported this library:
 
+* [TypeScript port](https://github.com/velipso/polybool) -- My initial stab at porting to TypeScript, still needs testing
 * [Java port by @the3deers](https://github.com/the3deers/polybool-java)
 * [Java port by @Menecats](https://github.com/Menecats/polybool-java)
 * [.NET port by @idormenco](https://github.com/idormenco/PolyBool.Net)