Squashed commit of the following:

commit a5b43f029b
Author: IMR <i.martinez08@alumni.imperial.ac.uk>
Date:   Tue Sep 6 13:48:00 2016 +0100

    Elaborated on the description

commit bf87feb9a1
Author: IMR <i.martinez08@alumni.imperial.ac.uk>
Date:   Tue Sep 6 13:47:10 2016 +0100

    Add Freesound API

README.md

@@ -207,6 +207,7 @@ A collective list of JSON APIs for use in web development.
 |---|---|---|---|
 | Discogs | Music | No | [Go!](https://www.discogs.com/developers/) |
 | EchoNest | Music | No | [Go!](http://developer.echonest.com/docs/v4) |
+| Freesound | Field recordings and samples uploaded by the community, including analytical descriptors | Yes | [Go!](https://www.freesound.org/docs/api/) |
 | Jamendo | Music | Yes | [Go!](https://developer.jamendo.com/v3.0) |
 | LastFm | Music | No | [Go!](http://www.last.fm/api) |
 | Mixcloud | Music | No | [Go!](https://www.mixcloud.com/developers/) |