Update README.md

Author: Swati4star

README.md

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 ### Badges
 [![Build Status](https://travis-ci.org/Swati4star/Images-to-PDF.svg?branch=master)](https://travis-ci.org/Swati4star/Images-to-PDF) [![Circle CI](https://circleci.com/gh/Swati4star/Images-to-PDF.svg?style=svg)](https://circleci.com/gh/Swati4star/Images-to-PDF)
 
+[<img src="https://f-droid.org/badge/get-it-on.png" alt="Get it on F-Droid" height="80">](https://f-droid.org/app/swati4star.createpdf)
+
 Have JPG when you need a PDF? Convert JPG to PDF in a few seconds! :smiley:
 Here is an easy to use android app to convert images to PDF file!