Update the docs

Author: joaocarmo

.DS_Store

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+.gitattributes export-ignore
+assets export-ignore
+README.md export-ignore

.gitattributes

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 A collection of person plugins for [xbar][xbar], [SwiftBar][swiftbar], etc.
 
+## Install xbar/SwiftBar
+
+```sh
+brew install xbar
+
+# or
+
+brew install swiftbar
+```
+
 ## Screenshot Settings
 
 Provides you with an easy way to change macOS' native screenshot settings.
 
 ![Screenshot Settings](./assets/screenshot-settings-preview.png)
 
+### Install Screenshot Settings
+
+1. Download the latest [plugin][screenshot-settings] version
+1. Extract the archive
+1. Place the `screenshot-settings.sh` file in your xbar/SwiftBar plugins
+   directory
+
 <!-- References -->
 
+[screenshot-settings]: https://github.com/joaocarmo/xbar-plugins/releases
 [swiftbar]: https://github.com/swiftbar/SwiftBar
 [xbar]: https://github.com/matryer/xbar