Improve the new developer experience

[analogue]

My muscle memory for getting things to work without thinking too hard isn't working with nerve_tools.

spatel@dev57-uswest1adevc:~/git/analogue/nerve-tools (master) $ make
make: 'bintray.json' is up to date.
spatel@dev57-uswest1adevc:~/git/analogue/nerve-tools (master) $ make test
make: *** No rule to make target 'test'.  Stop.
spatel@dev57-uswest1adevc:~/git/analogue/nerve-tools (master) $ make acceptance
make: *** No rule to make target 'acceptnace'.  Stop.
spatel@dev57-uswest1adevc:~/git/analogue/nerve-tools (master) $ make itest
make: *** No rule to make target 'itest'.  Stop.
spatel@dev57-uswest1adevc:~/git/analogue/nerve-tools (master) $ make help

Can we get a DEVELOPER.md that provides some hints?