Write generated files to disk sequentially with README

[lastmjs]

as we are writing did, js, binary to disk in the .azle directory, should we do that as we go? And should we output maybe a README that explains what is going on and explains how far along in the process we got?

Basically as we create the main.js, canister_name.wasm, canister_name.did files it might be good to write them sequentially into the .azle directory, this way if something goes wrong you would kind of know at what point that happened. Also a README might be really nice to teach people what's going on.