Add edatec-cm4-sensing (#501)

* Add edatec cm4sensing

CM4 sensing is an industrial computer designed for IoT & Data Acquisition  applications based on Raspberry Pi Compute Module 4.

* Add board-edatec-cm4-sensing.jpg

* add board-edatec-cm4-nano.jpg

* add edatec cm4 nano

A CM4-based board offers the same functionality of the Standard Raspberry Pi 4.

* Delete edatec-cm4-nano-computer.md

* Delete board-edatec-cm4-nano.jpg

Author: JohnZong66

_boards_cm/edatec-cm4-sensing-computer.md

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+---
+layout: board
+title: "EDATEC CM4 Sensing Computer"
+short_description: A CM4 carrier and metal enclosure designed for IoT & Data Acquisition with a number of interface options.
+status: production
+picture: "/images/board-edatec-cm4-sensing.jpg"
+github_issue: "https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/500"
+link: https://www.edatec.cn/en/Product/Embedded_Computers/2021/0930/132.html
+videos:
+  - https://www.youtube.com/watch?v=Hf2arUy0zxk
+---
+The [EDATEC CM4 Sensing](https://www.edatec.cn/en/Product/Embedded_Computers/2021/0930/132.html)  is an industrial computer designed for IoT & Data Acquisition  applications based on Raspberry Pi Compute Module 4. It provides 4G/LTE module, 4 channels RS485,1 channel RS232, 1 channel CAN, 1 channel Gigabit Ethernet port, alarm buzzer ,battery-powered real-time clock, 2 channels USB2.0 and 1 channel Micro USB2.0 interface.