Create README.md

Author: Pastou

README.md

@@ -109,7 +109,7 @@ In the case of the example above, an image of 400px × 600px will be resize
 Crop modes:
 
 Few crop mode options are available in order for you to choose how you want to handle the eventual exceeding width or height after resizing down your image. 
-The default crop mode used is the 'CROPCENTER' one which value is 2.
+The default crop mode used is the `CROPCENTER`.
 As a result those pieces of code are equivalent: 
 
 ```php
@@ -120,26 +120,26 @@ $image->save('image2.jpg');
 
 ```php
 $image = new ImageResize('image.jpg');
-$image->crop(200, 200, 2);
+$image->crop(200, 200, ImageResize::CROPCENTER);
 $image->save('image2.jpg');
 ```
 
 In the case you have an image of 400px × 600px and you want to crop it to 200px × 200px the image will be resized down to 200px × 300px, then you can indicate how you want to handle those 100px exceeding passing the value of the crop mode you want to use.
 
-For instance passing the crop mode 'CROPTOP' equal to 1 will result as 100px taken off the bottom leaving you with 200px × 200px.
+For instance passing the crop mode `CROPTOP` will result as 100px taken off the bottom leaving you with 200px × 200px.
 
 
 ```php
 $image = new ImageResize('image.jpg');
-$image->crop(200, 200, 1);
+$image->crop(200, 200, ImageResize::CROPTOP);
 $image->save('image2.jpg');
 ```
 
-On the contrary passing the crop mode 'CROPBOTTOM' equal to 3 will result as 100px taken off the top leaving you with 200px × 200px.
+On the contrary passing the crop mode `CROPBOTTOM` will result as 100px taken off the top leaving you with 200px × 200px.
 
 ```php
 $image = new ImageResize('image.jpg');
-$image->crop(200, 200, 3);
+$image->crop(200, 200, ImageResize::CROPBOTTOM);
 $image->save('image2.jpg');
 ```