add bcl to Configuration section (#5289)

Hi! Requesting add after few months of polishing the BCL project. Pleasr review

README.md

@@ -443,6 +443,7 @@ _Libraries for building standard or basic Command Line applications._
 _Libraries for configuration parsing._
 
 - [aconfig](https://github.com/cristalhq/aconfig) - Simple, useful and opinionated config loader.
+- [bcl](https://github.com/wkhere/bcl) - BCL is a configuration language similar to HCL.
 - [cleanenv](https://github.com/ilyakaznacheev/cleanenv) - Minimalistic configuration reader (from files, ENV, and wherever you want).
 - [config](https://github.com/JeremyLoy/config) - Cloud native application configuration. Bind ENV to structs in only two lines.
 - [config](https://github.com/num30/config) - configure your app using file, environment variables, or flags in two lines of code