claujson-document

first check!

01. 64bit only
02. need fast memory allocator like mimalloc, for speed.
03. C++14~ 
04. experimental!
05. Array has std::vector<_Value>
06. Object has std::vector<Pair<_Value, _Value>> (not a std::map!)
07. in Object, key can be dupplicated, are not sorted, just in order of input.
08. scanning - modified? simdjson, parsing - parallel 
09. it is not read-only! 
10. _Value <- json_Value, (in destructor, no remove data(Array or Object!), no copy, only move or clone!
11. Value <- wrap _Value, (in destructor, remove data(Array or Object!)
12. Array, Object <- in destructor, remove data.

parallel parse

parallel write