rename features to app

rename app to applications

wiki/applications/iButton-contact-keys.md

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+Flipper Zero has a built-in 1-Wire pad to read iButton (DS1990A) keys, also known as TouchMemory or Dallas keys. This technology is quite old but still widely used around the world. It's based on 1-Wire protocol and doesn't have any authentication, so Flipper can easily read these keys, save IDs into the memory, write IDs to blank keys, and emulate the key itself.
+
+* **Reading & Writing & Emulating**
+* **Protocol detection**: юзер может определить тип ключа поднося ключ к флипперу и тип считывателя поднося флиппер к домофону (цифрал, даллас и т.д.)
+
+<img width="300" src="https://github.com/Flipper-Zero/wiki/raw/master/images/ibutton/P1020756.jpg" />
+
+## Reading
+`iButton(1-Wire) -> Reading`
+
+Flipper will wait for iButton tag.  While waiting red LED is blinking.  
+Lean tag on iButton reader in the back side of Flipper Zero:
+
+<img width="300" src="https://github.com/Flipper-Zero/wiki/raw/master/images/ibutton/read1.jpeg" />
+
+# UI
+
+## Main menu
+
+* Read
+* Saved Keys
+* Enter manually