📝 Document how to set output dtype using turbofish operator

Show how the turbofish operator (e.g. `::<f32, _>`) can be used to set the output dtype from the `read_geotiff` function. Mention all supported dtypes in crate-level docs at src/lib.rs.

README.md

@@ -54,7 +54,7 @@ async fn main() {
     };
 
     // Read GeoTIFF into an ndarray::Array
-    let arr: Array3<f32> = read_geotiff(stream).unwrap();
+    let arr: Array3<f32> = read_geotiff::<f32, _>(stream).unwrap();
     assert_eq!(arr.dim(), (1, 549, 549));
     assert_eq!(arr[[0, 500, 500]], 0.13482364);
 }

src/lib.rs

@@ -38,11 +38,16 @@
 //!         Cursor::new(bytes)
 //!     };
 //!
-//!     let arr: Array3<f32> = read_geotiff(stream).unwrap();
+//!     let arr: Array3<f32> = read_geotiff::<f32, _>(stream).unwrap();
 //!     assert_eq!(arr.dim(), (1, 549, 549));
 //!     assert_eq!(arr[[0, 500, 500]], 0.13482364);
 //! }
 //! ```
+//!
+//! Note that the output dtype can be specified either by using a type hint
+//! (`let arr: Array3<f32>`) or via the turbofish operator (`read_geotiff::<f32>`).
+//! Currently supported dtypes include uint (u8/u16/u32/u64), int (i8/i16/i32/i64) and
+//! float (f32/f64).
 
 /// Modules for handling Input/Output of GeoTIFF data
 pub mod io;