Add AccessibilitySnapshotPointfree Plugin (#356)

* Add AccessibilitySnapshotPointfree Plugin

* Update README.md

Author: Sherlouk

README.md

@@ -204,6 +204,8 @@ end
   - [swift-html](https://github.com/pointfreeco/swift-html) is a Swift DSL for type-safe, extensible, and transformable HTML documents and includes an `HtmlSnapshotTesting` module to snapshot test its HTML documents.
 
   - [GRDBSnapshotTesting](https://github.com/SebastianOsinski/GRDBSnapshotTesting) adds snapshot strategy for testing SQLite database migrations made with [GRDB](https://github.com/groue/GRDB.swift).
+  
+  - [AccessibilitySnapshot+SnapshotTesting](https://github.com/Sherlouk/AccessibilitySnapshot-SnapshotTesting) adds [AccessibilitySnapshot](https://github.com/cashapp/AccessibilitySnapshot) support for SnapshotTesting.
 
 Have you written your own SnapshotTesting plug-in? [Add it here](https://github.com/pointfreeco/swift-snapshot-testing/edit/master/README.md) and submit a pull request!