Add board definition for Wemos C3 Pico V1.0.0 - Lolin

Add board definition for Wemos C3 Pico V1.0.0 - Lolin
https://www.wemos.cc/en/latest/c3/c3_pico.html

Author: lboue

variants/lolin_c3_pico/pins_arduino.h

@@ -0,0 +1,31 @@
+// https://www.wemos.cc/en/latest/c3/c3_pico.html
+
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+static const uint8_t LED_BUILTIN = 7;
+#define BUILTIN_LED  LED_BUILTIN // backward compatibility
+#define LED_BUILTIN LED_BUILTIN  // allow testing #ifdef LED_BUILTIN
+
+static const uint8_t TX = 21;
+static const uint8_t RX = 20;
+
+static const uint8_t SDA = 8;
+static const uint8_t SCL = 10;
+
+static const uint8_t VBAT  = 3;
+
+static const uint8_t SCK   = 2;
+static const uint8_t MISO  = 0;
+static const uint8_t MOSI  = 4;
+
+static const uint8_t A0 = 0;
+static const uint8_t A1 = 1;
+static const uint8_t A2 = 2;
+static const uint8_t A3 = 3;
+static const uint8_t A4 = 4;
+static const uint8_t A5 = 5;
+
+#endif /* Pins_Arduino_h */