add CONTRIBUTEING

CONTRIBUTEING.md

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+# How to Contribute to the PasswordBox App
+## How to Find Tasks
+We use [GitHub Issues](https://github.com/KaitoMuraoka/PasswordBox/issues) for task management. Please search for an issue you would like to contribute to there. Issues labeled with ["good first issue"](https://github.com/KaitoMuraoka/PasswordBox/contribute) are recommended for your first contribution.
+
+You can also submit a [Pull Request](https://github.com/KaitoMuraoka/PasswordBox/pulls) without an existing issue. In that case, please provide details such as the reason, cause, and solution in the Pull Request.
+
+## How to Start Contributing
+If you find a task you want to work on, leave a comment on the issue (e.g., “:raising_hand:”) to avoid overlapping work with others.
+We will respond to your comment as soon as possible, but feel free to start working on the task once you’ve commented!
+
+## How to Discuss and Propose Ideas
+Using GitHub Issues is preferable, but if you have specific ideas for implementation or refactoring, Pull Requests are also welcome.
+
+## App Translation
+TBD
+
+## Web site
+TBD
+
+## App Design
+I am not a designer. If you have better app or icon designs, please feel free to create an issue.
+
+## Languages for Issues, Comments, and Reviews
+
+Please use either English or Japanese for comments.
+
+## Note
+If you have any questions, feel free to ask anything through [GitHub Issues](https://github.com/KaitoMuraoka/PasswordBox/issues)!

PasswordBox/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BGTaskSchedulerPermittedIdentifiers</key>
+	<array/>
+</dict>
+</plist>