Add Wemos C3 Board

_board/lolin_c3_mini.md

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+---
+layout: download
+board_id: "lolin_c3_mini"
+title: "LOLIN C3 Mini Download"
+name: "LOLIN C3 Mini"
+manufacturer: "LOLIN"
+board_url: "https://www.wemos.cc/en/latest/c3/c3_mini.html"
+board_image: "lolin_c3_mini.jpg"
+date_added: 2021-11-2
+family: esp32c3
+bootloader_id: lolin_c3_mini
+features:
+  - Wi-Fi
+  - USB-C
+  - BLE
+  - Breadboard-Friendly
+
+---
+
+A development boards with an OLED and a small form factor.
+
+## Features
+
+- based ESP32-C3 WIFI & Bluetooth LE RISC-V Single-Core CPU
+- Type-C USB
+- 4MB Flash
+- Clock speed: 160 Mhz
+- 12x Digital IO
+- ADC, I2C, SPI, UART
+- Size: 34.3 mm x 25.4 mm
+- Weight: 2.4g
+- Compatible with LOLIN D1 mini shields
+- Compatible with MicroPython, Arduino and ESP-IDF
+- Default firmware: MicroPython
+
+
+## About WIFI
+
+You need set WIFI Tx Power to 8.5dBm to use WIFI.
+`wifi.radio.tx_power = 8.5`
+
+>Note: This is only available in CircuitPython daily builds since 4 July 2022
+and is not yet in a CircuitPython Major Release.
+
+## Purchase
+
+* [AliExpress](https://www.aliexpress.com/item/1005004005736554.html)
+
+## Learn More
+
+* [Manufacturer Specifications](https://www.wemos.cc/en/latest/c3/c3_mini.html)
+* [ESP32-C3 Datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf)
+* [Schematic](https://www.wemos.cc/en/latest/_static/files/sch_c3_mini_v1.0.0.pdf)
+* [Dimension](https://www.wemos.cc/en/latest/_static/files/dim_c3_mini_v1.0.0.pdf)