add heltec-mesh-node-t096 board

Author: Quency-D

meshtastic/mesh.proto

@@ -870,6 +870,11 @@ enum HardwareModel {
    */
   TDISPLAY_S3_PRO = 126;
 
+  /*
+   * Heltec Mesh Node T096 board features an nRF52840 CPU and a TFT screen.
+   */
+  HELTEC_MESH_NODE_T096 = 126;
+
   /*
    * ------------------------------------------------------------------------------------------------------------------------------------------
    * Reserved ID For developing private Ports. These will show up in live traffic sparsely, so we can use a high number. Keep it within 8 bits.