Update ADOPTERS.md

Signed-off-by: Russell Trow <russell@greensoftware.foundation>

Author: russelltrow

ADOPTERS.md

@@ -1 +1,8 @@
+# Adopters
 
+If you're using the Green Software Patterns, we'd love to add you to this list. Please reach out to principles@greensoftware.foundation or raise a pull request.
+
+| Organization | Description of Use | Contact |
+|--------------|--------------------|---------|
+| [AVEVA](https://www.aveva.com/en/)        |                    |         |
+| [Mastercard](https://www.mastercard.co.uk/en-gb.html)   |                    |         |