Add HLA-VScript addon (#213)

* Add HLA-VScript addon

* chore: Update Addon Metadata

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: FrostSource

.gitmodules

@@ -209,3 +209,6 @@
 [submodule "addons/umbrella-unstable/module"]
 	path = addons/umbrella-unstable/module
 	url = https://github.com/demiurgeQuantified/UmbrellaAddon-Unstable
+[submodule "addons/HLA-VScript/module"]
+	path = addons/HLA-VScript/module
+	url = https://github.com/FrostSource/HLA-VScript.git

addons/HLA-VScript/info.json

@@ -0,0 +1,6 @@
+{
+  "name": "Half Life Alyx VScript API",
+  "description": "Definitions for the Half Life Alyx Lua API.",
+  "size": 217875,
+  "hasPlugin": false
+}