Add instructions to flash firmware on NUSense and other STM32 projects.

[Claegtun]

PR description here.

Todo

• If you have more things to do
• Add them here

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[JohanneMontano]

no screenshots and images?

[Claegtun]

no screenshots and images?

@JohanneMontano No. If you deem it absolutely necessary, then I can make some, but it would be a pain.

[ysims]

Useful page to get merge in. If you want images, I'd recommend just keeping it in mind and get whoever does it next time to visually document the process and put in a PR.

[relzp]

Looks good to me!
I ran through the instructions on a clean install of STM32CubeIDE and a clean clone of the NUcontroller repo, and it worked out fine

[relzp]

While I was running through the instructions I noticed some things that might trip up somebody new:

• If the NUSense.elf file doesn't exist (i.e you haven't built the code yet), and you auto generate a debug config, it won't be able to find the elf file and the C/C++ Application field will not be populated, creating a broken config which will fail to run, saying it cannot find the program file (since there is no program file defined in the config)
• If you don't have the NUSense project selected, you cannot enter the project properties through the Project tab, and if you create a debug config, it won't auto select the NUSense project.