fix: README vim.pack instructions (#385)

README.md

@@ -15,6 +15,19 @@
 
 Install `rose-pine/neovim` using your favourite package manager:
 
+### [Built-in vim.pack](https://neovim.io/doc/user/pack/#_plugin-manager)
+
+```lua
+vim.pack.add({
+	{
+		src = "https://github.com/rose-pine/neovim",
+		name = "rose-pine",
+	},
+})
+require("rose-pine").setup()
+vim.cmd("colorscheme rose-pine")
+```
+
 ### [pam.nvim](https://github.com/mvllow/pam.nvim)
 
 ```lua

lua/rose-pine.lua

@@ -223,6 +223,9 @@ local function set_highlights()
 		Type = { fg = palette.foam },
 		TypeDef = { link = "Type" },
 		Underlined = { fg = palette.iris, underline = true },
+		Added = { fg = groups.git_add },
+		Changed = { fg = groups.git_change },
+		Removed = { fg = groups.git_delete },
 
 		healthError = { fg = groups.error },
 		healthSuccess = { fg = groups.info },