Update README.md

README.md

-# Projection matrix plot
+# Grid corner plot
 
 A corner plot for an array of dependent values
 
-Given an `N` dimensional set of data (i.e. some function evaluated over a grid
+Given an N-dimensional set of data (i.e. some function evaluated over a grid
 of coordinates), plot all possible 1D and 2D projections in the style of a
 ["corner" plot](http://corner.readthedocs.io/en/latest/pages/quickstart.html).
 
-# Example
+## Installation
+Clone the repository and then
+```bash
+$ python setup install
+```
+
+## Example
 
 Generating some fake data and plotting:
 
@@ -33,7 +39,7 @@ fig.savefig('example')
 ```
 ![Example plot](example.png)
 
-# Acknowledgements
+## Acknowledgements
 
 The code uses both the central idea and some specific code from
 [corner.py](https://github.com/dfm/corner.py)