Translation of GitHub wiki pages

I have translated Compiler Internals wiki page to Japanese as a part of Japanese advent calendar for Crystal language.

Although it’s little old, I think it’s a very good document as the first step to read crystal compiler source and to understand how the compiler works.
Thank you for this great document.

Could you tell me if there are any problems with this translation.

I hope to read full version of this document when the compiler version reach 1.0 .