Phobos is the standard library that comes with the D Programming Language Compiler.
Phobos is packaged together with the compiler. You should download the whole precompiled package.
To build everything yourself, there is a description in the wiki.
Phobos is distributed under Boost Software Licence. See the licence file.
I would add use cases for the program which would help use this.
Great! See the CONTRIBUTING.md file.