UPDATE: Adds a bunch of documentation and examples

base/src/lib.rs

@@ -1,4 +1,24 @@
-#![deny(clippy::unwrap_used)]
+//! # IronCalcBase engine API
+//!
+//! This is the documentation for the base engine API.
+//!
+//! # Basic usage
+//!
+//! Add the dependency in Cargo.toml:
+//!
+//! ```toml
+//! [dependencies]
+//! ironcalc_base = { git = "https://github.com/ironcalc/IronCalc", version = "0.1"}
+//! ```
+//!
+//! <small> until version 0.5.0 you should use the git dependencies as stated </small>
+//!
+//! In this example we use the excel function `CONCAT` to concatenate strings in cells `A1` and `B1`:
+//!
+//! ```rust
+#![doc = include_str!("../examples/hello_world.rs")]
+//! ```
+
 pub mod calc_result;
 pub mod cell;
 pub mod expressions;