component/bt: add link of tutorial in README.rst

examples/bluetooth/gatt_client/README.md

@@ -6,4 +6,4 @@ Run the gatt_server demo, the client demo will automatically connect to the gatt
 Client demo will enable gatt_server's notify after connection. Then the two devices will exchange
 data.
 
-
+Please check the [tutorial](tutorial/gatt_client_example_walkthrough.md) for more information about this example.

examples/bluetooth/gatt_security_client/README.md

@@ -6,3 +6,4 @@ This is the demo for user to use ESP BLE security API to connection with peer de
 2.Used the esp_ble_set_encryption API to start encryption with peer device, if the peer device take the initiative encryption, should used the esp_ble_gap_security_rsp API to sent response to peer device when receive the ESP_GAP_BLE_SEC_REQ_EVT.
 3.It will receive the ESP_GAP_BLE_AUTH_CMPL_EVT event when encryption finish will peer device.
 
+Please check the [tutorial](tutorial/GATT_Security_Client_Example_Walkthrough.md) for more information about this example.

examples/bluetooth/gatt_security_server/README.md

@@ -6,4 +6,5 @@ This is the demo for user to use ESP BLE security API to connection with peer de
 2.Used the esp_ble_set_encryption API to start encryption with peer device, if the peer device take the initiative encryption, should used the esp_ble_gap_security_rsp API to sent response to peer device when receive the ESP_GAP_BLE_SEC_REQ_EVT.
 3.It will receive the ESP_GAP_BLE_AUTH_CMPL_EVT event when encryption finish will peer device.
 
+Please check the [tutorial](tutorial/GATT_SECURITY_SERVER_EXAMPLE_WALKTHROUGH.md) for more information about this example.
 

examples/bluetooth/gatt_server/README.md

@@ -6,3 +6,5 @@ be connected by client. Run the gatt_client demo, the client demo will automatic
 to the gatt_server demo. The client demo will enable gatt_server's notify after connection.
 Then the two devices will exchange data.
 
+Please check the [tutorial] (./tutorial/GATT_SERVER_EXAMPLE_WALKTHROUGH.md) for more information about this example.
+

examples/bluetooth/gatt_server_service_table/README.md

@@ -8,3 +8,4 @@ One is use the esp_gatts_create_service or esp_ble_gatts_add_char and etc.
 The other way is use esp_ble_gatts_create_attr_tab.
 The important things: the two ways cannot use in the same service, but can use in different service.
 
+Please check the [tutorial](tutorial/GATT_Server_Service_Table_Example_Walkthrough.md) for more information about this example.

examples/bluetooth/gattc_multi_connect/README.md

@@ -7,3 +7,4 @@ Modify the name of gatt_server demo named ESP_GATTS_DEMO_a, ESP_GATTS_DEMO_b and
 the gattc_multi_connect demo will connect the three gatt_server demos, and then exchange data.
 Of course you can also modify the code to connect more devices, we default to connect up to 4 devices, more than 4 you need to modify menuconfig.
 
+Please check the [tutorial](tutorial/GATT_Client_Multi-Connection_Example_Walkthrough.md) for more information about this example.