Add section on licenses (#452)

Author: jarrodmillman

content/about/_index.md

@@ -46,6 +46,10 @@ powers Scientific Python.
 
 ## What We Do
 
+We release all our work openly. In particular, all our code is released under a
+[3-Clause BSD](https://opensource.org/license/bsd-3-clause/) or [MIT](https://opensource.org/license/mit/) license
+and documentation is released under the [CC-BY](https://creativecommons.org/licenses/by/4.0/) license.
+
 - **SPECs**
   [Scientific Python Ecosystem Coordination]({{< relref "/specs" >}})
   documents are a mechanism by which practices are