doc: add example of using advanced keymapping to readme

README.md

@@ -138,6 +138,23 @@ lua <<EOF
 EOF
 ```
 
+### Advanced use cases:
+
+You can set `accept_keymap` and `dismiss_keymap` to `false` to disable them, then you can create mappings using `require('tabnine.keymaps')`
+
+```lua
+--- Example integration with Tabnine and LuaSnip; falling back to inserting tab if neither has a completion
+vim.keymap.set("i", "<tab>", function()
+  if require("tabnine.keymaps").has_suggestion() then
+    return require("tabnine.keymaps").accept_suggestion()
+  elseif require("luasnip").jumpable(1) then
+    return require("luasnip").jump(1)
+  else
+    return "<tab>"
+  end
+end, { expr = true })
+```
+
 ## Activate Tabnine Pro
 
 - `:TabnineHub` - to open Tabnine Hub and log in to your account