add documentation for binder to readme and examples docs

Author: clmould

README.md

@@ -17,6 +17,11 @@ PROCESS was originally a Fortran code, but is now a pure-Python command line pro
 ## Getting Started
 Please see the [installation guide](https://ukaea.github.io/PROCESS/installation/introduction/) and the [usage guide](https://ukaea.github.io/PROCESS/usage/running-process/). Once installed, take a look at the [examples page](https://ukaea.github.io/PROCESS/usage/examples/) for examples of how PROCESS can be run, and its results visualised. 
 
+If you wish to run the examples before installing, you can click on the `binder` badge at the top of the README, or 
+can click [here](https://mybinder.org/v2/gh/ukaea/PROCESS/HEAD). Once loaded, you can double click the `examples` tab down the
+left hand side and select an example to run using jupyter. There is also a terminal option in Binder which would allow you to run
+PROCESS from your browser.
+
 ## Documentation
 To read about how the code works and the modules in it see the [documentation](https://ukaea.github.io/PROCESS/).
 

documentation/usage/examples.md

@@ -35,6 +35,11 @@ python -m notebook
 
 A web browser will open and the notebook can be run from there. If you're using WSL, you'll have to `ctrl + click` the link.
 
+### Notebooks via Binder
+Another way of running the PROCESS example notebooks is to use Binder. This uses a JupyterHub server to host the contents of
+PROCESS, allowing the examples to be run via a web browser and without installation on your computer. You can click 
+[here](https://mybinder.org/v2/gh/ukaea/PROCESS/HEAD) to try this out.
+The Binder may take some time to load, but once loaded you will see options down the left hand side - double click on `examples` and then `examples.ipynb`, then you can run this notebook in your web browser.
 
 ## Maintaining notebooks