Add css-modules-kit (zed-industries#2685)

This is an extension that adds language features for CSS Modules.

mizdra/css-modules-kit#180

Links
- Extension:
https://github.com/mizdra/css-modules-kit/tree/main/crates/zed
- package: https://www.npmjs.com/package/@css-modules-kit/ts-plugin
- package repo:
https://github.com/mizdra/css-modules-kit/tree/main/packages/ts-plugin

Author: mizdra

.gitmodules

@@ -418,6 +418,10 @@
 	path = extensions/cspell
 	url = https://github.com/mantou132/zed-cspell
 
+[submodule "extensions/css-modules-kit"]
+	path = extensions/css-modules-kit
+	url = https://github.com/mizdra/css-modules-kit.git
+
 [submodule "extensions/csv"]
 	path = extensions/csv
 	url = https://github.com/huacnlee/zed-csv.git

extensions.toml

@@ -420,6 +420,11 @@ version = "0.1.2"
 submodule = "extensions/cspell"
 version = "0.0.3"
 
+[css-modules-kit]
+submodule = "extensions/css-modules-kit"
+version = "0.0.1"
+path = "crates/zed"
+
 [csv]
 submodule = "extensions/csv"
 version = "0.0.2"