Silly-J's design and implementation

[green-coder]

Silly-J is a syntax that should look familiar to Clojure programmers while being specific to text template description. It contains convenient short-hands.

The use case for the first milestone (see the project's Kanban) will use it to generate a few HTML files and a lot of CLJ / CLJS files.

[green-coder]

Some of the early sketches of Silly-J can be found here: https://github.com/clojure-tw/hopen/blob/54a30e15b07facc90fc781a9ce4d5a31a29748a2/README.md

@hylisd : I am pointing the file just in case it can be of any use, but feel free to implement Silly-J the way you want.

[green-coder]

I propose that syntax's parser to live in hopen/syntax/silly_j.cljc(namespace hopen.syntax.silly-j) or in hopen/syntax/silly_j/.... if needed.