Merge pull request vsouza#2469 from pmukherj/master

Added Placenote

README.md

@@ -265,6 +265,7 @@ Awesome-iOS is an amazing list for people who need a certain feature on their ap
 * [ARVideoKit](https://github.com/AFathi/ARVideoKit) - Record and capture ARKit videos 📹, photos 🌄, Live Photos 🎇, and GIFs 🎆. 
 * [ARKitEnvironmentMapper](https://github.com/svtek/ARKitEnvironmentMapper) - A library that allows you to generate and update environment maps in real-time using the camera feed and ARKit's tracking capabilities. 
 * [SmileToUnlock](https://github.com/rsrbk/SmileToUnlock) - This library uses ARKit Face Tracking in order to catch a user's smile.
+* [Placenote](https://github.com/Placenote/PlacenoteSDK-iOS) - A library that makes ARKit sessions persistent to a location using advanced computer vision
 
 ## Authentication
 * [Heimdallr.swift](https://github.com/trivago/Heimdallr.swift) - Easy to use OAuth 2 library for iOS, written in Swift.