Add bootstrapper to get developers up faster (like efler?) about fyne HOT 4 CLOSED

With the new (now default) OpenGL driver this should no longer be needed.

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This now works for Mac OS X and some modern Linux distros - Windows may be a bigger problem...

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For those people who prefer to follow the specific steps instead of running a bootstrap script (either to learn about the explicit dependencies of the project, or simply not trusting install scripts in general), these are the steps I took to get Fyne running on Arch Linux.

sudo pacman -Sy efl
go get -u github.com/fyne-io/fyne/...
go get -u github.com/fyne-io/examples/cmd/fractal
fractal

Worked perfectly.

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Thanks, I have updated the docs a little at https://github.com/fyne-io/bootstrap/ to try and help folk find this out if that's what they would prefer.

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