Add NOTICE file with copyright information.

SuperQ · SuperQ · commit 055dcc4a1e85 · 2021-03-25T10:48:02.000+01:00
Signed-off-by: Ben Kochie &lt;superq@gmail.com&gt;
diff --git a/NOTICE b/NOTICE
@@ -0,0 +1,2 @@
+Copyright 2018 William Rouesnel
+Copyright 2021 The Prometheus Authors

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Copyright 2018 William Rouesnel`
	`2`	`+Copyright 2021 The Prometheus Authors`