docs: update dev instructions for typing (#49)

README.md

@@ -201,6 +201,7 @@ lua_ls = {
           vim.fn.expand "$VIMRUNTIME/lua",
           vim.fn.expand "$VIMRUNTIME/lua/vim/lsp",
           vim.fn.stdpath "data" .. "/lazy/lazy.nvim/lua/lazy",
+          vim.fn.expand "$HOME/path/to/parent" -- parent/avante.nvim
           "${3rd}/luv/library",
         },
       },
@@ -209,6 +210,8 @@ lua_ls = {
 },
 ```
 
+Then you can set `dev = true` in your `lazy` config for development.
+
 ## License
 
 avante.nvim is licensed under the Apache License. For more details, please refer to the [LICENSE](./LICENSE) file.