feat(lsp): config for qmlls

lua/plugins/20-lsp.lua

@@ -25,6 +25,9 @@ return {
             slint_lsp = {
                 root_dir = function() end, -- Fix missing root_dir issue in neoconf (lspconfig doesn't define it...)
             },
+            qmlls = {
+                cmd = { "qmlls6" },
+            },
         },
     },
 }