Add Unit MiniOLED example

Author: Tinyu-Zhao

examples/KIT/SCALES_KIT/SCALES_KIT.ino

@@ -34,8 +34,8 @@ M5Canvas canvas(&display);
 HX711 scale;
 
 void setup() {
-    M5.begin();               // Init M5Stack.  初始化M5Stack
-    M5.Power.begin();         // Init power  初始化电源模块
+    M5.begin();        // Init M5Stack.  初始化M5Stack
+    M5.Power.begin();  // Init power  初始化电源模块
     display.begin();
     canvas.setColorDepth(1);  // mono color
     canvas.createSprite(display.width(), display.height());

examples/Unit/MiniOLED/MiniOLED.ino

@@ -0,0 +1,40 @@
+/*
+*******************************************************************************
+* Copyright (c) 2023 by M5Stack
+*                  Equipped with M5Core sample source code
+*                          配套  M5Core 示例源代码
+* Visit for more information: https://docs.m5stack.com/en/unit/MiniOLED%20Unit
+* 获取更多资料请访问: https://docs.m5stack.com/zh_CN/unit/MiniOLED%20Unit
+*
+* Describe: Unit MiniOLED
+* Date: 2023/07/28
+*******************************************************************************
+  Depend Libraries:
+  -[U8g2](https://github.com/olikraus/U8g2_Arduino)
+  Please install the required libraries and connect the Unit MiniOLED to the
+  PORT-A port (G21/22)
+  请安装依赖库并将Unit MiniOLED 连接到PORT-A端口(G21/22)
+*/
+#include <Arduino.h>
+#include <U8g2lib.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+U8G2_SSD1306_72X40_ER_F_HW_I2C u8g2(
+    U8G2_R0, /* reset=*/U8X8_PIN_NONE);  // EastRising 0.42" OLED
+
+void setup(void) {
+    Wire.begin(SDA_PIN, SCL_PIN);
+    u8g2.begin();
+}
+
+void loop(void) {
+    u8g2.clearBuffer();                  // clear the internal memory
+    u8g2.setFont(u8g2_font_ncenB08_tr);  // choose a suitable font
+    u8g2.drawStr(10, 20, "Hello");  // write something to the internal memory
+    u8g2.drawStr(10, 30, "M5Stack!");
+    u8g2.sendBuffer();  // transfer internal memory to the display
+    delay(1000);
+}