Update README.md
green mode works(ish)

can turn green light on or off, but now it does a couple cool tricks.
source file for real this time
Adds .gitignore
.gitignore plz work
Button system reconfiguration, work on modes

Hopefully .gitignore works now
interrupt handler make switching, yes please
fixed lights staying on during flashing mode
fixes alternate flashes changing from green to flash mode
ignore debug.map
#Sharma'd

Fixes weird double-blink when switching to green mode
Only need to press green button once #rekt #nomore
progress before Mitch interrupted..get it?
Clears interrupt always (tm)
Timers correctly done, debounce = yes

Sharma is our hero, she is #1
Thx Sharma + Obama
updated debug comments
Merge pull request #8 from stevelyall/bus-2-crosswalk-mode

Crosswalk mode implemented