Update README.md

README.md

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 - Charts - Make Beutiful Charts in your App
 - etc...
 
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 ## Localization
 
 Localization is the process of making your app support other languages. (Base language is English)
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  - [localazy](https://localazy.com/) localization tool for iOS and macOS apps. Supporting .strings, .stringsdict, .plist and XLIFF files.
  - [locastudio](https://www.cunningo.com/locastudio/index.html) Analyze, review, and edit your app translations.
 
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 ## Accessibility
 
 Accessibility is all about making the iPhone, iPod touch, and iPad work for as wide a range of people as possible. That can include the very young, the very old, people brand new to computers and mobile devices, and also people with disabilities and special needs. 
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  - accessibilityTraits - collection of constants that describe the type of control and/or hot it should be treated
  - accessibilityValue - Used to describe the value of a none-label UI component e.g. "50%" for progress bar
 
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 ## GCD
 GCD(Grand Central Dispatch) is a low-level API for managing concurrent operations. It can help you improve your app’s responsiveness by deferring computationally expensive tasks to the background.
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 ## Thread Sanitizer
 Thread Sanitizer is a tool to identifies the potential thread-related corruption issues. And it is a good way to find the [Readers and Writers problem](https://en.wikipedia.org/wiki/Readers%E2%80%93writers_problem) in your application.
 
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 ### How to Use Address Sanitizer
 
 Go to this Option and Click **EDIT SCHEME...** 👈
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 For more info, go to [Apple Developer Website](https://developer.apple.com/documentation/Xcode/Xcode-Cloud)
 
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 ## In App Purchase(IAP)