update readme

README.md

@@ -44,30 +44,64 @@ This plugin uses `sql.nvim` to perform the database transactions.
 
 ## Installation
 
-TODO: add installation instructions for other package managers
+### [Packer.nvim](https://github.com/wbthomason/packer.nvim) 
 
-```
+```lua
 use {
   "sunjon/telescope-frecency",
   config = function()
     require"telescope".load_extension("frecency")
   end
 }
-
 ```
+
+_TODO: add installation instructions for other package managers_
+
 If no database is found when running Neovim with the plugin installed, a new one is created and entries from `shada` `v:oldfiles` are automatically imported.
 
-## Configuration
-
-Function for keymaps
-
-```lua
-lua require("telescope").extensions.frecency.frecency(opts)
-```
+## Commands and Function
 
 ```
 :Telescope frecency
 ```
+..or to map to a key:
+
+```lua
+vim.api.nvim_set_keymap("n", "<leader><leader>", "<Cmd>lua require('telescope').extensions.frecency.frecency()<CR>", {noremap = true, silent = true})
+```
+
+## Configuration
+
+See [default configuration](https://github.com/nvim-telescope/telescope.nvim#telescope-defaults) for full details on configuring Telescope.
+
+- `ignore_patterns`
+
+This setting controls which files are indexed (and subsequently which you'll see in the finder results).
+
+- `show_scores`
+
+To see the scores generated by the algorithm in the results, set this to `true`.
+
+
+If you've not configured the extension, the following values are used: 
+
+```
+telescope.setup {
+  extensions = {
+    frecency = {
+      show_scores = false,
+      ignore_patterns = {"*.git/*", "*/tmp/*"},
+    }
+  },
+}
+```
+
+### Highlight Groups
+
+```vim
+TelescopePathSeparator
+TelescopeBufferLoaded
+```
 
 ## References