docs(public reference): add Brsk as a public reference (#4597)

Adding brsk as public ref

Author: leandrodamascena

README.md

@@ -53,6 +53,7 @@ Knowing which companies are using this library is important to help prioritize t
 
 The following companies, among others, use Powertools:
 
+* [Brsk](https://www.brsk.co.uk/)
 * [Capital One](https://www.capitalone.com/)
 * [CPQi (Exadel Financial Services)](https://cpqi.com/)
 * [CloudZero](https://www.cloudzero.com/)

docs/index.md

@@ -424,6 +424,9 @@ Knowing which companies are using this library is important to help prioritize t
 
 <div class="grid" style="text-align:center;" markdown>
 
+[**Brsk**](https://www.brsk.co.uk/){target="_blank" rel="nofollow"}
+{ .card }
+
 [**Capital One**](https://www.capitalone.com/){target="_blank" rel="nofollow"}
 { .card }