Add mentions to license exception for nftables

Add a clarification about the reasoning behind considering nftables as a
package that matches Apertis License Expectations.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

content/policies/license-exceptions.md

@@ -256,3 +256,47 @@ Each exception must provide the following information:
   </td>
 </tr>
 </table>
+
+## nftables
+
+<table>
+<colgroup>
+  <col style="width: 20%" />
+  <col style="width: 80%" />
+</colgroup>
+<tr>
+  <th>project</th>
+  <td>nftables</td>
+</tr>
+<tr>
+  <th>component</th>
+  <td>apertis:*:target</td>
+</tr>
+<tr>
+  <th>date</th>
+  <td>July  14, 2022</td>
+</tr>
+<tr>
+  <th>validator</th>
+  <td>wlozano</td>
+</tr>
+<tr>
+  <th>rule</th>
+  <td>No GPL v3</td>
+</tr>
+<tr>
+  <th>reason</th>
+  <td>
+   <p><code>nftables</code> includes Bison-exception as described in
+    <a href="https://spdx.org/licenses/Bison-exception-2.2.html">Bison Exception</a>
+    which clearly states that is possible to create a lager work that contains part or
+    all of the Bison parser skeleton and distribute that work under terms of your choice,
+    so long as that work isn't itself a parser generator using the skeleton or a modified
+    version thereof as a parser skeleton.
+   </p>
+   <p>
+    Based on these facts, the package is considered GPL-3 free.
+   </p>
+  </td>
+</tr>
+</table>