Added luacheck

.luacheckrc

@@ -0,0 +1,13 @@
+unused_args = true
+allow_defined_top = false
+
+globals = {
+    "minetest",
+    "core",
+    "yl_matterbridge"
+}
+
+read_globals = {
+    -- Builtin
+    "dump", "DIR_DELIM"
+}