Add 'Front-End Frameworks '

Front-End-Frameworks-.md

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+## Front-End Frameworks 
+_for building websites and applications (free open source)_
+
+
+* [Bootstrap](https://getbootstrap.com/) 
+
+* [React-Bootstrap](https://react-bootstrap.github.io/)
+
+* [Vue](https://vuejs.org/); 
+
+* [Bootstrap-Vue](https://bootstrap-vue.org/play)
+
+* [React](https://reactjs.org/);
+
+* [React Native — focus on mobile](https://en.wikipedia.org/wiki/React_Native)
+
+* [Angular](https://angularjs.org/) + [W3 ref.](https://www.w3schools.com/angular/);
+
+* [Gatsby](https://www.gatsbyjs.com/docs/quick-start/)
+
+* [List of SSG and Frameworks](https://jamstack.org/generators/)