Add UART Terminal app

by cool4uma

https://github.com/cool4uma/UART_Terminal/tree/main

applications/plugins/uart_terminal/README.md

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+# UART Terminal for Flipper Zero
+[Flipper Zero](https://flipperzero.one/) app to control various devices via UART interface.
+
+## Capabilities
+- Read log and command output by uart
+- Send commands by uart
+- Set baud rate
+- Fast commands
+
+## Connecting
+| Flipper Zero pin | UART interface  |
+| ---------------- | --------------- |
+| 13 TX            | RX              |
+| 14 RX            | TX              |
+|8, 18 GND         | GND             |
+
+Info: If possible, do not power your devices from 3V3 (pin 9) Flipper Zero. It does not support hot plugging.
+
+## Keyboard
+UART_terminal uses its own special keyboard for work, which has all the symbols necessary for working in the console.
+
+To accommodate more characters on a small display, some characters are called up by holding.
+
+![kbf](https://user-images.githubusercontent.com/122148894/212286637-7063f1ee-c6ff-46b9-8dc5-79a5f367fab1.png)
+
+
+## How to install
+Copy the contents of the repository to the applications_user/uart_terminal folder Flipper Zero firmware and build app with the command ./fbt fap_uart_terminal.
+
+Or use the tool [uFBT](https://github.com/flipperdevices/flipperzero-ufbt) for building applications for Flipper Zero.
+
+## How it works
+
+
+![1f](https://user-images.githubusercontent.com/122148894/211161450-6d177638-3bfa-42a8-9c73-0cf3af5e5ca7.jpg)
+
+
+![2f](https://user-images.githubusercontent.com/122148894/211161456-4d2be15b-4a05-4450-a62e-edcaab3772fd.jpg)
+
+
+![4f](https://user-images.githubusercontent.com/122148894/211161461-4507120b-42df-441f-9e01-e4517aa83537.jpg)
+
+## INFO:
+
+~70% of the source code is taken from the [Wifi Marauder](https://github.com/0xchocolate/flipperzero-firmware-with-wifi-marauder-companion) project. Many thanks to the developers of the Wifi Marauder project.