Add example to documentation

Author: TypicalHog

src/lib.rs

@@ -1,18 +1,31 @@
-//! The official Rust implementation of the RANDEVU algorithm
+//! The official Rust implementation of the [RANDEVU](https://github.com/TypicalHog/randevu) algorithm
+//!
+//! # Example
+//! ```rust
+//! use randevu::{rdv, utc_date_with_offset};
+//!
+//! fn main() {
+//!     let object = "THE_SIMPSONS";
+//!     let date = utc_date_with_offset(0);
+//!     let rdv = rdv(object, &date);
+//!
+//!     println!("Object {} has RDV{} today", object, rdv);
+//! }
+//! ```
 
 use blake3;
 use chrono::{Duration, Utc};
 
-/// Returns current UTC date (String) in ISO 8601 format, with an offset (i64) in days
+/// Returns current UTC DATE `String` in ISO 8601 format (YYYY-MM-DD), with an OFFSET `i64` in days
 pub fn utc_date_with_offset(offset: i64) -> String {
     (Utc::now() + Duration::days(offset))
         .format("%Y-%m-%d")
         .to_string()
 }
 
-/// Returns RDV level (u32) for an object (&str) on a specific date (&str)
+/// Returns RDV level `u32` for an OBJECT `&str` on a specific DATE `&str`
 ///
-/// RDV = number of leading zero bits in blake3(blake3(OBJECT) || blake3(DATE))
+/// **RDV = number of leading zero bits in blake3(blake3(OBJECT) || blake3(DATE))**
 pub fn rdv(object: &str, date: &str) -> u32 {
     let mut hasher = blake3::Hasher::new();
     hasher.update(blake3::hash(object.as_bytes()).as_bytes());