Update the clients/vim/README.md (TabbyML#253)

Added a section that explains how to install the extension on packer and lazy.

clients/vim/README.md

@@ -7,17 +7,39 @@
 
 ## Getting started
 
-### Plug
+### 🔌 Vim-Plug
 ```
 " Make sure that the filetype plugin has been enabled.
 filetype plugin on
 
-" Assume using vim-plug as plugin manager
+" Add this to the vim-plug config
 Plug 'TabbyML/tabby', {'rtp': 'clients/vim'}
 
 " Set URL of Tabby server
 let g:tabby_server_url = 'http://127.0.0.1:8080'
 ```
+### 📦 Packer and Lazy
+In this case, you first need to clone the repo in your machine
+```
+git clone https://github.com/TabbyML/tabby.git ~/tabby
+```
+Then on the config file:
+```
+" For lazy
+return { name = "tabby", dir = '~/tabby/clients/vim', enabled = true }
+
+" For packer
+use {'~/tabby/clients/vim', as = 'tabby', enabled = true}
+
+" Set URL of Tabby server
+
+" With Lua
+vim.g.tabby_server_url = 'http://127.0.0.1:8080'
+
+" With VimScript
+let g:tabby_server_url = 'http://127.0.0.1:8080'
+```
+> In the future, the ideal would be to export the Vim extension to a separate Git repository. This would simplify the installation process [#252](https://github.com/TabbyML/tabby/issues/252).
 
 ## Usage