doc(l2sim): adding a light tutorial for L2 sim + proxy using containers

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

doc/L2NFAPI.md

@@ -46,6 +46,8 @@ This proxy allows to perform L2 nFAPI simulator for:
 * 5G-NSA
 * 5G-SA
 
+Another tutorial for 5G SA mode with 1 User is available [here](../ci-scripts/yaml_files/5g_l2sim_tdd/README.md).
+
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 [oai wiki home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)