Added additional license information to the README files.

README

diff --git a/README b/README
index 24fc238..5e5356d 100644
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+++ b/README
@@ -6,6 +6,10 @@
 Written by Tim Edwards 2019 / 2020 for efabless (efabless.com)
 and Open Circuit Design (opencircuitdesign.com)
 
+URL: http://opencircuitdesign.com/open_pdks
+
+Distributed under the Apache-2.0 license (see file LICENSE).
+
 ----------------------------------------------------------------------------------
 
 Introduction:

README.md

diff --git a/README.md b/README.md
index 12651e0..b71f842 100644
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@@ -29,9 +29,18 @@
 
 -----------------------------------------
 
+License:
+
+Open_PDKs is open-source software distributed under the Apache-2.0 license.
+See file LICENSE for the complete license text.
+
+-----------------------------------------
+
 Instructions:
 
 There is a top-level Makefile but generally it is recommended to cd
 to the directory for the target foundry process and follow the instructions
 in the README file there.
 
+Also see the website at http://opencircuitdesign.com/open_pdks
+