Updated README.md

Moved C static library generation to Usage section.

Author: saurvs

README.md

@@ -6,6 +6,8 @@ Currently, only single file and save dialogs are supported, and the crate has be
 
 ## Usage
 
+* Follow the instructions [here](https://github.com/mlabbe/nativefiledialog/blob/master/README.md) to build the libraries in C and an OS-specific language. Then, set the `NFD_LIB_DIR` environment variable to the path of the directory in which the libraries are stored.
+
 * Add the dependency `nfd` in your ```Cargo.toml```
   ```toml
   [dependencies]
@@ -34,6 +36,3 @@ Currently, only single file and save dialogs are supported, and the crate has be
 ## Screenshot
 
 ![Cocoa on El Capitan](screenshots/cocoa_el_capitan.png?raw=true)
-
-## To build
-Follow the instructions [here](https://github.com/mlabbe/nativefiledialog/blob/master/README.md) to build the libraries in C and an OS-specific language. Then, set the `NFD_LIB_DIR` environment variable to the path of the directory in which the libraries are stored. Now run `cargo build`.