feat(dx): add .luarc.json file

Author: gorillamoe

.luarc.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
+  "runtime.version": "LuaJIT",
+  "diagnostics.globals": [
+    "vim"
+  ],
+  "runtime.settings.path": [
+    "?.lua",
+    "?/init.lua"
+  ],
+  "workspace.checkThirdParty": false,
+  "workspace.library": [
+    "$VIMRUNTIME"
+  ]
+}