psm: add status for loongarch64

Author: xry111

psm/README.mkd

@@ -476,6 +476,21 @@ Unless there is a non-obvious mistake, this should work fine.
 
 The assembly code for riscv64 has been tested locally with a C caller.
 
+</td>
+</tr>
+
+<tr>
+<td rowspan="2">loongarch64</td>
+<td rowspan="2">&#42;</td>
+<td>Yes</td>
+<td>Locally</td>
+<td>Unknown</td>
+</tr>
+<tr>
+<td colspan="3">
+
+The assembly code for loongarch64 has been tested locally with a C caller.
+
 </td>
 </tr>
 </table>