dulaj michael

fixed the issue 42 by running "npm i ajv" after "npm install" .Edited the README.md and added "npn i ajv" after "npm install"

Updated the README.md Then windows users know that they cant run this on windows #40

fixes #38 fixed the gradient has outdated direction syntax in main.css

fixes #33 Removed the useless constructor used in Navigation.js. it's only necessary to pass props into the constructor if you intend on using this.props inside the constructor. 

fixes #31 ` imageClick()} />`