Tasks:

• create a TypeScript first configuration
• create tsbuild npm script
• create the file bits/04_base64.ts

With this PR, I proposed to create the file bits/04_base64.ts and the corresponding .js is generated running the command npm run tsbuild, which will create bits/04_base64.js file.

I've kept the original tsconfig.json file to be easier to adjust if we want to. When the final configuration arrives, we delete all commented properties.