move some doc to gitlab

doc/L2NFAPI.md

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+<table style="border-collapse: collapse; border: none;">
+  <tr style="border-collapse: collapse; border: none;">
+    <td style="border-collapse: collapse; border: none;">
+      <a href="http://www.openairinterface.org/">
+         <img src="../images/oai_final_logo.png" alt="" border=3 height=50 width=150>
+         </img>
+      </a>
+    </td>
+    <td style="border-collapse: collapse; border: none; vertical-align: center;">
+      <b><font size = "5">L2 nFAPI Simulator Usage</font></b>
+    </td>
+  </tr>
+</table>
+
+This simulator allows to test L2 and above Layers using the nFAPI interface.
+
+**This simulator is available starting the `v1.0.0` release on the `master` branch.**
+
+Currently the only validated deployment by CI and developers is *with S1 interface and eNB / UEs are on the same machine*.
+
+Others deployments will be supported later after bug fixes and validation in the CI process.
+
+1. [With S1 -- eNB and UE on same machine](L2NFAPI_S1.md)
+
+
+
+
+
+
+
+[oai wiki home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)
+
+[oai softmodem features](FEATURE_SET.md)
+
+[oai softmodem build procedure](BUILD.md)
+