`rstr` is a library for managing a content-addressable blob store.
Add files or directories to the blob store:
```rust
use rstr::{BlobStore,BlobRef};
use std::path::{Path, PathBuf};
let blob_store = BlobStore::new("../tests/test_data_store").unwrap();
let n_threads: u8 = 8;
let (blob_refs_with_paths, _): (Vec<(PathBuf, BlobRef)>, _) = blob_store.add_files(
);