feat(file_selector): add intergration with nvim-tree.lua (#1987)

Co-authored-by: doodleEsc <cokie@foxmail.com>
Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

README.md

@@ -7,6 +7,7 @@
    </a>
 
 ### [Warp, the intelligent terminal for developers](https://www.warp.dev/avantenvim)
+
 [Available for MacOS, Linux, & Windows](https://www.warp.dev/avantenvim)<br>
 
 </div>
@@ -954,6 +955,43 @@ If you have the following structure:
 >
 > `*.avanterules` is a jinja template file, in which will be rendered using [minijinja](https://github.com/mitsuhiko/minijinja). See [templates](https://github.com/yetone/avante.nvim/blob/main/lua/avante/templates) for example on how to extend current templates.
 
+## Integration
+
+Avante.nvim can be extended to work with other plugins by using its extension modules. Below is an example of integrating Avante with [`nvim-tree`](https://github.com/nvim-tree/nvim-tree.lua), allowing you to select or deselect files directly from the NvimTree UI:
+
+```lua
+{
+    "yetone/avante.nvim",
+    event = "VeryLazy",
+    keys = {
+        {
+            "<leader>a+",
+            function()
+                local tree_ext = require("avante.extensions.nvim_tree")
+                tree_ext.add_file()
+            end,
+            desc = "Select file in NvimTree",
+            ft = "NvimTree",
+        },
+        {
+            "<leader>a-",
+            function()
+                local tree_ext = require("avante.extensions.nvim_tree")
+                tree_ext.remove_file()
+            end,
+            desc = "Deselect file in NvimTree",
+            ft = "NvimTree",
+        },
+    },
+    opts = {
+        --- other configurations
+        selector = {
+            exclude_auto_select = { "NvimTree" },
+        },
+    },
+}
+```
+
 ## TODOs
 
 - [x] Chat with current file