Add TermGL (#172)

TermGL is a terminal-based graphics library for 2D and 3D graphics.

README.md

@@ -176,6 +176,7 @@ List of projects that provide terminal user interfaces
 - [termbox2](https://github.com/termbox/termbox2) A terminal rendering library for creating TUIs.
 - [textual](https://github.com/willmcgugan/textual) is a TUI (Text User Interface) framework for **Python** inspired by modern web development.
 - [Thermage](https://github.com/thermage/thermage) Thermage is a **PHP** library that provides a fluent and incredibly powerful, object-oriented interface for customizing CLI output text color, background, formatting, theming and more.
+- [TermGL](https://github.com/wojciech-graj/TermGL) A terminal-based graphics library for 2D and 3D graphics.
 - [tui-go](https://github.com/marcusolsson/tui-go) A **Go** UI library for terminal applications (deprecated)
 - [tui-rs](https://github.com/fdehau/tui-rs) Terminal user interfaces and dashboards using **Rust** (no longer maintained, use Ratatui instead).
 - [tuibox](https://github.com/Cubified/tuibox) A single-header **C** terminal UI library, capable of creating mouse-driven, interactive applications on the command line.