Added README.md to example category folders

examples/bluetooth/README.md

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+# Bluetooth Examples
+
+Note: To use examples in this directory, you need to have Bluetooth enabled in configuration. Run `make menuconfig`, go to `Component config` and verify if you see `[*] Bluetooth`. If not - enable if and save.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/ethernet/README.md

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+# Ethernet Examples
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/get-started/README.md

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+# Get Started Examples
+
+Simple code to get started with ESP32 and ESP-IDF.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/peripherals/README.md

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+# Peripherals Examples
+
+This section provides examples how to configure and use ESP32’s internal peripherals like GPIO, UART, I2C, SPI, timers, counters, ADC / DAC, PWM, etc.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/protocols/README.md

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+# Protocols Examples
+
+Implementation of internet communication protocols and services.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/protocols/mdns/README.md

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-# 30_mdns example
+# mDNS example
 
 Shows how to use mDNS to advertise lookup services and hosts
 

examples/storage/README.md

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+# Storage Examples
+
+Storage and management of user and system data in module’s flash and on external memory / devices.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/system/README.md

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+# System Examples
+
+Configuration and management of memory, interrupts, WDT (watchdog timer), OTA (over the air updates), deep sleep and logging.
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.

examples/wifi/README.md

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+# Wi-Fi Examples
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.