[PATCH www] CONTRIBUTING: ask people to add copyright headers

[Alyssa Ross <hi@alyssa.is>]

I want to make sure we're collecting copyright information right from
the start, because it's much easier to keep track of this as content
is created, rather than try to piece it together after the fact should
we ever need to.
---
 CONTRIBUTING | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/CONTRIBUTING b/CONTRIBUTING
index b2941cf..6cbc106 100644
--- a/CONTRIBUTING
+++ b/CONTRIBUTING
@@ -17,6 +17,14 @@ self-close?), and CSS to a minimum.  We want to optimise for the
 website being as nice as possible to navigate in a text editor, to
 encourage people to edit and improve the website.
 
+For any changes that are likely to be copyrightable (i.e. those that
+involve any amount of creative input from you), please add an
+SPDX-FileCopyrightText header to the file so we can keep track of
+copyright holders.  Every file should already have at least one
+example of these that you can use as a template.  If you'd rather not
+list your email address in the copyright notice, it's fine to omit
+that.
+
 Please send patches to devel@spectrum-os.org.  Instructions for how to
 do this are provided in the contributing.html file.
 
-- 
2.27.0