Added Binder link and notebook to README (#18)

Author: egpbos

README.md

@@ -1,10 +1,12 @@
 # ![xtensor-fftw](http://quantstack.net/assets/images/xtensor-fftw.svg)
 
+[![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/egpbos/xtensor-fftw/master?filepath=notebooks%2Fintensely_edgy_cat.ipynb)
+[![Join the Gitter Chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/QuantStack/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
 [![Travis](https://travis-ci.org/egpbos/xtensor-fftw.svg?branch=master)](https://travis-ci.org/egpbos/xtensor-fftw)
 [![Appveyor](https://ci.appveyor.com/api/projects/status/l4wgk98kwospu7n1?svg=true)](https://ci.appveyor.com/project/egpbos/xtensor-fftw)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/18861a283cf84b2e95886ba79c66e028)](https://www.codacy.com/app/egpbos/xtensor-fftw?utm_source=github.com&utm_medium=referral&utm_content=egpbos/xtensor-fftw&utm_campaign=Badge_Grade)
 [![Coverage Status](https://coveralls.io/repos/github/egpbos/xtensor-fftw/badge.svg)](https://coveralls.io/github/egpbos/xtensor-fftw)
-[![Join the Gitter Chat](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/QuantStack/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 [FFTW](http://www.fftw.org/) bindings for the [xtensor](https://github.com/QuantStack/xtensor) C++ multi-dimensional array library.
 
@@ -97,6 +99,9 @@ std::cout << "cos:            " << xt::cos(x) << std::endl;
 std::cout << "sin_derivative: " << sin_derivative << std::endl;
 ```
 
+### Interactive examples
+See the [notebooks folder](https://github.com/egpbos/xtensor-fftw/tree/master/notebooks) for interactive Jupyter notebook examples using the C++14 [_xeus-cling_](https://github.com/QuantStack/xeus-cling) kernel. These can also be run from Binder, [e.g. this one](https://mybinder.org/v2/gh/egpbos/xtensor-fftw/master?filepath=notebooks%2Fintensely_edgy_cat.ipynb).
+
 
 ## Building and running tests