Add features: wi-fi

_board/espressif_kaluga_1.md

@@ -7,6 +7,8 @@ manufacturer: "Espressif"
 board_url: "https://www.adafruit.com/product/4729"
 board_image: "espressif_kaluga_1.jpg"
 date_added: 2020-08-30
+features:
+  - Wi-Fi
 ---
 
 The **ESP32-S2-Kaluga-1** kit is a full featured development kit by Espressif for the ESP32-S2 that comes with everything but the kitchen sink! From TFTs to touch panels, this dev board has it all. Espressif designed this kit to demonstrate the ESP32-S2’s human-computer interaction functionalities and provide the users with the tools for development of human-computer interaction applications based on their new WiFi modules with the ESP32-S2 chip

_board/espressif_saola_1_wroom.md

@@ -7,6 +7,8 @@ manufacturer: "Espressif"
 board_url: "https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/hw-reference/esp32s2/user-guide-saola-1-v1.2.html"
 board_image: "espressif_saola_1_wroom.jpg"
 date_added: 2020-05-15
+features:
+  - Wi-Fi
 ---
 
 This is the Saola dev board with a WROOM ESP32-S2 module.

_board/espressif_saola_1_wrover.md

@@ -7,6 +7,8 @@ manufacturer: "Espressif"
 board_url: "https://www.adafruit.com/product/4693"
 board_image: "espressif_saola_1_wrover.jpg"
 date_added: 2020-05-15
+features:
+  - Wi-Fi
 ---
 
 **ESP32-S2 Saola-1** is a small-sized ESP32-S2 based development board produced by Espressif. Just about all of the I/O pins are broken out to the pin headers on both sides for easy interfacing. Developers can either connect peripherals with jumper wires or mount ESP32-S2 Saola-1 on a breadboard - we recommend two breadboards 'side-by-side' since the Saola is a bit wide and you won't have extra holes on one side for wiring.