hg: jdk/sandbox: 2 new changesets

[chris.hegarty at oracle.com]

Changeset: e3b80847346f
Author:    ehelin
Date:      2020-08-27 14:33 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/e3b80847346f

8251551: Use .md filename extension for README
Reviewed-by: mr, ihse, darcy

- README
+ README.md

Changeset: 65f472440f4b
Author:    ehelin
Date:      2020-08-27 14:41 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/65f472440f4b

8251552: Add minimal CONTRIBUTING.md file
Reviewed-by: iris, ihse

+ CONTRIBUTING.md