README.md: Add instructions to configure SELinux

Amended-by: Alberto Bertogli <albertito@blitiri.com.ar> Adjusted commit message, adjusted wording in the docs.
albertito · Feb 9, 2024 · 148837f · 148837f
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diff --git a/README.md b/README.md
@@ -61,6 +61,14 @@ sudo cp etc/systemd/dns-to-https/*  /etc/systemd/system/
 sudo systemctl dnss enable
 ```
 
+On systems with SELinux, like Fedora, you might see hidden errors. In that
+case, run this to set the security context for the binary:
+
+```sh
+sudo semanage fcontext -a -t bin_t "/usr/local/bin/dnss"
+sudo restorecon -v /usr/local/bin/dnss
+```
+
 
 ## Examples