[tools]: add VS code and Lua Language Server config

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+    "Lua.runtime.version": "Lua 5.3",
+    "Lua.diagnostics.globals": [
+        "ardour",
+        "factory",
+        "icon",
+        "sess_params",
+        "signals"
+    ]
+}