Add Terbium (alilleybrinker#88)

README.md

@@ -77,6 +77,7 @@ Then it can be included in this list!
 | [Ry] | 22 | ☀️ Active | 👁‍🗨 An open source WIP programming language for web development with expressive type system that makes it easy to build reliable and efficient software. |
 | [Ellie] | 21 | ☀️ Active | Ellie is a type-safe programming language that runs on embedded and sandboxed environments. |
 | [Pr47] | 21 | ☀️ Active | The formal development repository for Pr47 |
+| [Terbium] | 18 | ☀️ Active | A high-level language that doesn't compromise in performance, made with Rust. |
 | [Wright] | 18 | ☀️ Active | The wright programming language (WIP) |
 | [The Force] | 15 | ☀️ Active | A Star Wars themed programming language |
 | [Sligh] | 9 | ☀️ Active | A language for model transformation |
@@ -249,4 +250,5 @@ broader than a programming language project.
 [Ry]: https://github.com/quantumatic/
 [Oriel]: https://github.com/wojciech-graj/oriel
 [Duckscript]: https://github.com/sagiegurari/duckscript
+[Terbium]: https://github.com/terbium-lang/terbium
 [Loxcraft]: https://github.com/ajeetdsouza/loxcraft