docs(ble): Added BLE Get Started documentation link to README.md

Author: weiyuhannnn

examples/bluetooth/ble_get_started/nimble/NimBLE_Beacon/README.md

@@ -11,9 +11,11 @@ This is a pretty simple example, aiming to introduce
 2. How to configure advertisement and scan response data
 3. How to start advertising as a non-connectable beacon
 
-It uses ESP32's Bluetooth controller and NimBLE host stack.
 
-To test this demo, any BLE scanner application can be used.
+To test this demo, install *nRF Connect for Mobile* on your phone. 
+
+Please refer to [BLE Device Discovery](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/ble/get-started/ble-device-discovery.html#:~:text=%E4%BE%8B%E7%A8%8B%E5%AE%9E%E8%B7%B5)
+for detailed example introduction and code explanation.
 
 ## Try It Yourself
 

examples/bluetooth/ble_get_started/nimble/NimBLE_Connection/README.md

@@ -11,9 +11,11 @@ This example is extended from NimBLE Beacon Example, and further introduces
 2. How to capture GAP events and handle them
 3. How to update connection parameters
 
-It uses ESP32's Bluetooth controller and NimBLE host stack.
 
-To test this demo, any BLE scanner application can be used.
+To test this demo, install *nRF Connect for Mobile* on your phone. 
+
+Please refer to [BLE Connection](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/ble/get-started/ble-connection.html#:~:text=%E4%BE%8B%E7%A8%8B%E5%AE%9E%E8%B7%B5)
+for detailed example introduction and code explanation.
 
 ## Try It Yourself
 
@@ -266,4 +268,3 @@ If everything goes well, except for what we have seen in NimBLE Beacon example,
 ## Troubleshooting
 
 For any technical queries, please file an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
-

examples/bluetooth/ble_get_started/nimble/NimBLE_GATT_Server/README.md

@@ -12,9 +12,10 @@ This example is extended from NimBLE Connection Example, and further introduces
     1. Write access demonstrated by LED control
     2. Read and indicate access demonstrated by heart rate measurement(mocked)
 
-It uses ESP32's Bluetooth controller and NimBLE host stack.
+To test this demo, install *nRF Connect for Mobile* on your phone. 
 
-To test this demo, any BLE scanner application can be used.
+Please refer to [BLE Introduction](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/ble/get-started/ble-introduction.html#:~:text=%E4%BE%8B%E7%A8%8B%E5%AE%9E%E8%B7%B5)
+for detailed example introduction and code explanation.
 
 ## Try It Yourself
 

examples/bluetooth/ble_get_started/nimble/NimBLE_Security/README.md

@@ -11,9 +11,8 @@ This example is extended from NimBLE GATT Server Example, and further introduces
 2. How to ask for connection encryption from peripheral side on characteristic access
 3. How to bond with peer device using a random generated 6-digit passkey
 
-It uses ESP32's Bluetooth controller and NimBLE host stack.
 
-To test this demo, any BLE scanner application can be used.
+To test this demo, install *nRF Connect for Mobile* on your phone. 
 
 ## Try It Yourself