Adding content to 119-deployment

src/roadmaps/flutter/content/119-deployment/100-appstore.md

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 # Appstore
+
+App Store is an important platform to consider when publishing Flutter apps. To publish an app on the App Store, developers need to have a developer account with Apple, which requires an annual fee.
+
+To publish a Flutter app on the App Store, developers need to ensure that their app meets Apple's guidelines and requirements, which include guidelines for performance, design, and user experience. Once the app has been reviewed and approved by Apple, it can be published on the App Store and made available for download to iOS users.
+
+Learn more from the following links:
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+- [Build and release an iOS app](https://docs.flutter.dev/deployment/ios)

src/roadmaps/flutter/content/119-deployment/101-guidelines-and-protocols.md

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-# Guidelines and protocols
+# Guidelines and Protocols
+
+Guidelines and protocols are important considerations for Flutter developers as they help to ensure that apps are built in a consistent, reliable, and user-friendly manner. Some of the key guidelines and protocols to consider when developing a Flutter app include:
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+- Flutter Widget
+- Dart Style
+- Material Design
+- Apple Human Interface
+- Google Play Developer Policy Center
+- App Store Review 
+
+By following these guidelines and protocols, Flutter developers can ensure that their apps are well-designed, user-friendly, and secure, making it easier to attract and retain users.
+
+Learn more from the following links:
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+- [Flutter - Protocols](https://api.flutter.dev/objcdoc/Protocols.html)

src/roadmaps/flutter/content/119-deployment/index.md

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 # Deployment
+
+Deployment in Flutter refers to the process of releasing a Flutter app to end-users. There are several steps involved in deploying a Flutter app, including:
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+- Building the app
+- Testing the app
+- Configuring app settings
+- Releasing to app stores
+- Updating the app
+
+In general, deploying a Flutter app involves a combination of technical skills and experience, as well as knowledge of the relevant app stores and their policies and requirements. 
+
+Learn more from the following links:
+
+- [Flutter - Web deployment](https://dart.dev/web/deployment)