Initial LSP setup with formatting and autocompletion

after/lsp/lua_ls.lua

@@ -0,0 +1,14 @@
+---@type vim.lsp.Config
+local settings = {
+  ---@type lspconfig.settings.lua_ls
+  settings = {
+    Lua = {
+      runtime = {
+        version = 'LuaJIT',
+      },
+      workspace = { checkThirdParty = false, library = vim.list_extend({ vim.fn.expand('$VIMRUNTIME') }, vim.api.nvim_get_runtime_file('lua', true)) },
+    },
+  },
+}
+
+return settings