Add build instructions to README.md

[surfdado]

Added instructions that worked for me

[kubark42]

This is (should be) natively supported already, although you have to have the bldc project installed first:

Windows: https://discord.com/channels/904830990319485030/910181652192448532/917434237991399424
POSIX-style: https://discord.com/channels/904830990319485030/910181652192448532/919240778088329267

[kubark42]

From Discord links:

macOS/Linux

1. Start with building the firmware as per the bldc repo's Readme.md
2. Then make qt_install
3. mkdir vesc_tool.build
4. cd vesc_tool.build
   5a) For macOS: ../tools/Qt/5.15.2/clang_64/bin/qmake ../../vesc_tool/vesc_tool.pro
   5b) For Linux: ../tools/Qt/5.15.2/gcc_64/bin/qmake ../../vesc_tool/vesc_tool.pro
5. make -j8
   7a) For macOS: ../tools/Qt/5.15.2/clang_64/bin/macdeployqt VESC\ Tool.app -dmg -qmldir=../../vesc_tool <-- This will make the VESC-tool and place it in vesc_tool.build/VESC Tool.dmg
   7b) For Linux: ../downloads/linuxdeployqt-continuous-x86_64.AppImage --appimage-extract-and-run ./vesc_tool_4.00 -qmldir=../../vesc_tool/ -appimage -always-overwrite -qmake=../tools/Qt/5.15.2/gcc_64/bin/qmake -unsupported-allow-new-glibc <-- This will make the VESC-tool and place it in either vesc_tool.build/Application-x86_64.AppImage or vesc_tool.build/vesc_tool_4.00

Windows

1. Start with building the firmware as per the repo's Readme.md
2. Then open up a cmd terminal (Resist the urge to run Powershell, that will break things.)
3. make qt_install
4. mkdir vesc_tool.build
5. cd vesc_tool.build
6. ..\tools\Qt\5.15.2\msvc2019_64\bin\qmake ..\..\vesc_tool\vesc_tool.pro
7. make -j8
8. ..\tools\Qt\5.15.2\msvc2019_64\bin\windeployqt --qmldir=..\..\vesc_tool\ .\release <-- This will make the VESC-tool and place it in the vesc_tool.build directory

[surfdado]

I don't have linuxdeployqt-continuous-x86_64.AppImage in ../downloads

[kubark42]

I don't have linuxdeployqt-continuous-x86_64.AppImage in ../downloads

Thanks! I'll try to fix that. linuxdeployqt is an oddball project, but really useful.

[surfdado]

I've only ever needed linuxdeployqt when generating Qt installers - but considering how the instructions hard-code an obsolete version number (4.0) maybe we should just have a shell script (build_vesc_tool_.sh) that does all the steps you outlined above so users don't need to copy paste all that

[Ahelsamahy]

I was trying to make the same installation on M1 (macOS 14.6.1) but couldn't make it work. However, I managed to make it run after a clean installation using these steps here Compile Vesc Tool on MackBook