add more lsp servers for nvim

nvim/lua/settings/lsp_config/sqls.lua

@@ -0,0 +1,23 @@
+local util = require 'lspconfig.util'
+
+return {
+  default_config = {
+    cmd = { 'sqls' },
+    filetypes = { 'sql', 'mysql' },
+    root_dir = util.root_pattern 'config.yml',
+    single_file_support = true,
+    settings = {},
+  },
+  docs = {
+    description = [[
+https://github.com/lighttiger2505/sqls
+```lua
+require'lspconfig'.sqls.setup{
+  cmd = {"path/to/command", "-config", "path/to/config.yml"};
+  ...
+}
+```
+Sqls can be installed via `go get github.com/lighttiger2505/sqls`. Instructions for compiling Sqls from the source can be found at [lighttiger2505/sqls](https://github.com/lighttiger2505/sqls).
+    ]],
+  },
+}