update readme.md

Author: rudyhuynh

.npmignore

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+example

README.md

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 A circular progress chart using react-native-svg
 
-![sample <>](https://github.com/stssoftware/react-native-svg-circular-progress/blob/master/Sample.png "Sample")
+![sample <>](https://github.com/stssoftware/react-native-svg-circular-progress/raw/master/Sample.png "Sample")
 
 ## Installation
 ````
 npm install react-native-svg react-native-svg-circular-progress --save
+react-native link
 ````
 
 ## Usage