feat: initial package draft

src/util.rs

@@ -0,0 +1,13 @@
+//! Small self-contained utilities with no knowledge of courses or assessments.
+//!
+//! Everything here exists because pulling in a crate for it was the worse trade.
+//! Each module is a few hundred lines of well-understood algorithm, and each
+//! replaces a dependency that would otherwise need to keep working for as long as
+//! a course repository needs to stay readable.
+
+pub mod date;
+pub mod hash;
+pub mod markup;
+pub mod rng;
+pub mod yaml;
+pub mod zipfile;