docs(docs): add snacks.nvim picker integration docs (#726)

Author: tku137

README.md

@@ -681,6 +681,27 @@ Requires [fzf-lua](https://github.com/ibhagwan/fzf-lua) plugin to be installed.
 
 </details>
 
+<details>
+<summary>snacks.nvim integration</summary>
+
+Requires [snacks.nvim](https://github.com/folke/snacks.nvim) plugin to be installed and the [picker](https://github.com/folke/snacks.nvim/blob/main/docs/picker.md) to be configured.
+
+```lua
+-- lazy.nvim keys
+
+  -- Show prompts actions with snacks.nvim picker
+  {
+    "<leader>ccp",
+    function()
+      local actions = require("CopilotChat.actions")
+      require("CopilotChat.integrations.snacks").pick(actions.prompt_actions())
+    end,
+    desc = "CopilotChat - Prompt actions",
+  },
+```
+
+</details>
+
 <details>
 <summary>render-markdown integration</summary>
 

doc/CopilotChat.txt

@@ -716,6 +716,23 @@ Requires fzf-lua <https://github.com/ibhagwan/fzf-lua> plugin to be installed.
         desc = "CopilotChat - Prompt actions",
       },
 <
+snacks.nvim integration ~
+
+Requires snacks.nvim <https://github.com/folke/snacks.nvim> plugin to be installed and the picker <https://github.com/folke/snacks.nvim/blob/main/docs/picker.md> to be configured.
+
+>lua
+    -- lazy.nvim keys
+    
+      -- Show prompts actions with snacks.nvim picker
+      {
+        "<leader>ccp",
+        function()
+          local actions = require("CopilotChat.actions")
+          require("CopilotChat.integrations.snacks").pick(actions.prompt_actions())
+        end,
+        desc = "CopilotChat - Prompt actions",
+      },
+<
 
 render-markdown integration ~