Adding info on PHY test docs link

suttonpd · suttonpd · commit 133e71a300dd · 2023-06-19T08:44:17.000-05:00
diff --git a/README.md b/README.md
@@ -76,3 +76,5 @@ make
 make test
 ```
 
+PHY layer tests use binary test vectors and are not built by default. To enable, see the [docs](https://docs.srsran.com/projects/project/en/latest/user_manuals/source/installation.html).
+
