Documentation update and doc-test update

Author: James O'Cull

README.md

@@ -6,7 +6,20 @@ Currently only `Length` is available, but I am planning to add more shortly.
 
 ### Example
 
+In your Cargo.toml...
+
+```
+[dependencies]
+measurements = "^0.1.0"
 ```
+
+In your code...
+
+```
+extern crate measurements;
+
+use measurements::length::Length;
+
 let football_field = Length::from_yards(1.0);
 let meters = football_field.as_meters();
 println!("There are {} meters in a football field.", meters);

src/lib.rs

@@ -7,6 +7,8 @@ mod tests;
 /// # Example
 /// 
 /// ```
+/// use measurements::length::Length;
+/// 
 /// let football_field = Length::from_yards(1.0);
 /// let meters = football_field.as_meters();
 /// println!("There are {} meters in a football field.", meters);