[librsvg: 2/8] Link to FEATURES.md from the README.md

[Marge Bot <marge-bot src gnome org>]

commit 5b8912ad5a836e9e5cb034717c207aa551ebb2f2
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Oct 13 11:58:46 2021 -0500

    Link to FEATURES.md from the README.md
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/605>

 README.md | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/README.md b/README.md
index 22977b24..b0f2928f 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,9 @@ API" kind of library.
 
 Feature additions will be considered on a case-by-case basis.
 
+You can read about librsvg's supported SVG and CSS features in the
+[FEATURES.md](FEATURES.md) file.
+
 Non-goals of librsvg
 --------------------