Add devilspie2 addon (#182)

Author: sparr

.gitmodules

@@ -193,3 +193,6 @@
 [submodule "addons/trilogyloader/module"]
 	path = addons/trilogyloader/module
 	url = https://github.com/fokichevskiy/TrilogySnippets.git
+[submodule "addons/devilspie2/module"]
+	path = addons/devilspie2/module
+	url = https://github.com/sparr/LuaLS-Addon-devilspie2.git

addons/devilspie2/info.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "https://raw.githubusercontent.com/LuaLS/LLS-Addons/main/schemas/addon_info.schema.json",
+  "name": "Devilspie2",
+  "description": "Definitions for Devilspie2 scripts and config"
+}