examples: Fix UART examples to match the template

examples/peripherals/uart_async_rxtxtasks/README.md

@@ -1,21 +1,65 @@
-UART asynchronous example, that uses separate RX and TX tasks
-=============================================================
+# UART Asynchronous Example with Separate Receive and Transfer Tasks
 
-Starts two FreeRTOS tasks:
-  - One task for transmitting 'Hello world' via the UART.
-  - One task for receiving from the UART.
+(See the README.md file in the upper level 'examples' directory for more information about examples.)
 
-If you'd like to see your ESP32 receive something, simply short
-TXD_PIN and RXD_PIN. By doing this data transmitted on TXD_PIN will
-be received on RXD_PIN. See the definitions of TXD_PIN and RXD_PIN
-in ./main/uart_async_rxtxtasks_main.c.
+This example demonstrates how two asynchronous tasks can use the same UART interface for communication. One can use
+this example to develop more complex applications for serial communication.
 
-The output for such configuration will look as follows: 
+The example starts two FreeRTOS tasks:
+1. The first task periodically transmits `Hello world` via the UART.
+2. The second task task listens, receives and prints data from the UART.
+
+## How to use example
+
+### Hardware Required
+
+The example can be run on any commonly available ESP32 development board. You will need a USB cable to connect the
+development board to a computer, and a simple one-wire cable for shorting two pins of the board.
+
+### Setup the Hardware
+
+The `RXD_PIN` and `TXD_PIN` which are configurable in the code (by default `GPIO4` and `GPIO5`) need to be shorted in
+order to receive back the same data which were sent out.
+
+### Configure the project
 
 ```
+make menuconfig
+```
+or
+```
+idf.py menuconfig
+```
+
+* Set serial port under Serial Flasher Options.
+
+### Build and Flash
+
+Build the project and flash it to the board, then run monitor tool to view serial output:
+
+```
+make -j4 flash monitor
+```
+or
+```
+idf.py flash monitor
+```
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+## Example Output
+
+You will receive the following repeating output from the monitoring console:
+```
+...
 I (3261) TX_TASK: Wrote 11 bytes
 I (4261) RX_TASK: Read 11 bytes: 'Hello world'
 I (4261) RX_TASK: 0x3ffb821c   48 65 6c 6c 6f 20 77 6f  72 6c 64                 |Hello world|
 ...
 ```
-The third line above prints received data in hex format, that comes handy to display non printable data bytes.
+
+## Troubleshooting
+
+If you do not see any output from `RX_TASK` then check if you have the `RXD_PIN` and `TXD_PIN` pins shorted on the board.