Merge branch 'eurecom_ausf' of gitlab.eurecom.fr:oai/cn5g/oai-cn5g-ausf into eurecom_ausf

docs/FEATURE_SET.md

+<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">OpenAirInterface AMF Feature Set</font></b>
+    </td>
+  </tr>
+</table>
+
+**Table of Contents**
+
+1. [5GC Service Based Architecture](#1-5gc-service-based-architecture)
+2. [OAI AUSF Available Interfaces](#2-oai-ausf-available-interfaces)
+3. [OAI AUSF Feature List](#3-oai-ausf-feature-list)
+
+# 1. 5GC Service Based Architecture #
+
+![5GC SBA](./images/5gc_sba.png)
+
+# 2. OAI AUSF Available Interfaces #
+
+| **ID** | **Interface** | **Status**         | **Comment**                                                               |
+| ------ | ------------- | ------------------ | --------------------------------------------------------------------------|
+| 1      | N12            | :heavy_check_mark: | Communicate with AMF     |
+| 2      | N13            | :heavy_check_mark: | Communicate with UDM     |
+                                            |
+
+# 3. OAI AUSF Feature List #
+
+Based on document **3GPP TS 23.501 V16.0.0 §6.2.8**.
+
+| **ID** | **Classification**                                      | **Status**         | **Comments**  |
+| ------ | ------------------------------------------------------- | ------------------ |---------------|
+| 1      | Supports authentication for 3GPP access                 | :heavy_check_mark: |               |
+| 2      | Supports authentication for untrusted non-3GPP access   | :x:                |               |
+      
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