Add Fig as an installation method to the README

README.md

@@ -6,6 +6,8 @@ and prompt themes.
 
 ## Installation
 
+### Manual
+
 Prezto will work with any recent release of Zsh, but the minimum required
 version is **4.3.11**.
 
@@ -71,6 +73,14 @@ version is **4.3.11**.
 
 05. Open a new Zsh terminal window or tab.
 
+### [Fig](https://fig.io)
+
+Fig adds apps, shortcuts, and autocomplete to your existing terminal.
+
+Install `prezto` in just one click.
+
+<a href="https://fig.io/plugins/other/prezto" target="_blank"><img src="https://fig.io/badges/install-with-fig.svg" /></a>
+
 ### Troubleshooting
 
 If you are not able to find certain commands after switching to Prezto, modify