Update bindings.md adding C-sharp bindings
As a C library, bindings can be made to call H3 functions from different programming languages. This page lists different bindings currently available. Contributions to this list are welcome, please feel free to open a [pull request](https://github.com/uber/h3/tree/master/docs/community/bindings.md).
-## C#
+## C-sharp
- [entrepreneur-interet-general/h3.standard](https://github.com/entrepreneur-interet-general/H3.Standard)
