Add ts_ls config

Author: ye-junzhe

Diff for: lua/Junzhe/plugins/lsp/lspconfig.lua

@@ -124,6 +124,8 @@ return {
         lspconfig["ts_ls"].setup({
             capabilities = capabilities,
             on_attach = on_attach,
+            root_dir = lspconfig.util.root_pattern("package.json"),
+            single_file_support = false
         })
 
         -- configure css server