update Documentation.md

Author: lukepistrol

Sources/CodeEditTextView/Documentation.docc/Documentation.md

@@ -6,8 +6,18 @@ A code editor with syntax highlighting powered by tree-sitter.
 
 ![logo](codeedittextview-logo)
 
+An Xcode-inspired code editor view written in Swift powered by tree-sitter for [CodeEdit](https://github.com/CodeEditApp/CodeEdit). Features include syntax highlighting (based on the provided theme), code completion, find and replace, text diff, validation, current line highlighting, minimap, inline messages (warnings and errors), bracket matching, and more.
+
 This package includes both `AppKit` and `SwiftUI` components. It also relies on the `CodeEditLanguages` and `Theme` module. 
 
+![banner](preview)
+
+## Syntax Highlighting
+
+``CodeEditTextView`` uses `tree-sitter` for syntax highlighting. A list of already supported languages can be found [here](https://github.com/CodeEditApp/CodeEditTextView/issues/15).
+
+New languages need to be added to the [CodeEditLanguages](https://github.com/CodeEditApp/CodeEditLanguages) repo.
+
 ## Dependencies
 
 Special thanks to both [Marcin Krzyzanowski](https://twitter.com/krzyzanowskim) & [Matt Massicotte](https://twitter.com/mattie) for the great work they've done!
@@ -27,4 +37,3 @@ Special thanks to both [Marcin Krzyzanowski](https://twitter.com/krzyzanowskim)
 ### Theme
 
 - ``EditorTheme``
-