This library is badly incomplete --- though at this point it is perhaps stable enough that pull requests could be accepted.
Currently development is following the needs of the Wizard's Wallet, which is a "lite" wallet which does SPV validation but maintains a full UTXO index. Its purpose is to be a usable-though-risky wallet which supports experimental user-facing features.
Pull requests to generalize the library or introduce new use cases would be great.
To build, start by obtaining cargo. Then just run cargo build.
To run the test cases, do cargo test. Note that the tests must pass (and reasonably
complete unit tests provided for new features) before any submissions can be accepted.