improved readme content and icon

README.md

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- ### Rebel - Fast, beautiful & focused note taking
+ # Rebel - Fast, beautiful & focused note taking
 
  Rebel aims to provide you a distraction-free note taking experience. Focus more on writing and less on formatting and saving. As you write your note, Rebel will format it based on your markdown syntax.
+ ![note taking with markdown](https://raw.githubusercontent.com/kumarasinghe/rebel/master/resources/rebel-in-action.gif)
+
+#### [Download for Windows, GNU/Linux and OSX](https://github.com/kumarasinghe/rebel/releases/latest)
+
+### FAQ
+- Where does it save my notes?
+ `<home directory>/.rebel`
+- Which markdown flavour does it use?
+ It supports the basic markdown syntax. Examples will be shown when you open Rebel for the first time.
+- How can I backup my notes?
+ zip `.rebel` directory in your home.
+- How can I report a problem or get support?
+ Please go to [issues](https://github.com/kumarasinghe/rebel/issues)