Document how to use DFU

[terrillmoore]

DFU is now supported. Need to pull in the instructions from pull request #24.

Split driver description up based on system in use:

1. Windows (as given in Added DFU programming support #24)
2. macOS (nothing to be done)
3. Linux (need to install the rules from drivers/linux/mccicatena4551.rules, restart the dbus daemon, and make sure current user is in plugdev group) -- perhaps we should grab the script from MCCI's usbiotest.

Ideally, we'd have a YouTube video for each system (WIndows, macOS, Linux).

[vpowar]

With regard to our slack conversation, I have documented some steps I followed for uploading code to 4551 Catena using DFU. It can be found here:
https://github.com/vpowar/LoRaWAN_SensorNetworks-Catena#uploading-code

[terrillmoore]

Very nice, thank you!

[svelmurugan92]

Document available here https://github.com/mcci-catena/HW-Designs/blob/master/Boards/Catena-4611_4612/234001173a_(Catena-4612-User-Manual).pdf

[terrillmoore]

Before I can close this, this needs to be linked from the BSP, because it's a common problem. We have a README.md, we should consider putting it there. Reassigning to @svelmurugan92 and @dhineshkumarmcci because you're working on the new BSP features.

[terrillmoore]

@svelmurugan92 @dhineshkumarmcci this is really important; I need to be able to point users to a procedure for the documeens for Windows.

Document available here https://github.com/mcci-catena/HW-Designs/blob/master/Boards/Catena-4611_4612/234001173a_(Catena-4612-User-Manual).pdf

@svelmurugan, this link is broken.

[svelmurugan92]

@terrillmoore Below links works. We will add this in README.md
234001173a_(Catena-4612-User-Manual).pdf