Add the infamous doit.js
Add the infamous doit.js

Test plan: run ./danaë.js --pretty addition_1 and inspect the output

Auditors: alpert, alex

iamchenxin/perseus,alexristich/perseus,chirilo/perseus,abe4mvp/perseus,ariabuckles/perseus,alexristich/perseus,sachgits/perseus,ariabuckles/perseus,ariabuckles/perseus,iamchenxin/perseus,daukantas/perseus,huangins/perseus,huangins/perseus,learningequality/perseus,daukantas/perseus,learningequality/perseus,junyiacademy/perseus,abe4mvp/perseus,chirilo/perseus,ariabuckles/perseus,junyiacademy/perseus,sachgits/perseus