added sections in readme

Author: adityapatadia

README.md

@@ -10,6 +10,8 @@ Hosted Solution
 
 If you don't want to crop, resize and store images on your server, <a href="https://www.gumlet.com" target="_blank">Gumlet.com</a> is a **free** service which can process images in real-time and serve worldwide through CDN.
 
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 Setup
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@@ -48,6 +50,8 @@ $image = new ImageResize();
 
 > Note: This library uses GD class which do not support resizing animated gif files
 
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 Resize
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@@ -310,6 +314,8 @@ API Doc
 
 https://eventviva.github.io/php-image-resize/class-Eventviva.ImageResize.html
 
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 Maintainer
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