Add PlatformIO project setup, local libraries, and PCB Gerber files

- Add platformio.ini for ESP32 DevKit (Arduino framework, espressif32 6.10.0)
- Vendor ArduinoJson, MPU6050_tockn, SCServo, Simple_FOC, and WebSockets
  so a fresh clone builds without downloading dependencies
- Add .gitignore rules for PlatformIO/IDE build artifacts
- Add controller PCB Gerber and drill files

3.Software/libraries/SCServo/examples/STSCL/WritePos/WritePos.ino

@@ -0,0 +1,31 @@
+/*
+The normal write example passed the test in ST3215 Servo, 
+and if testing other models of ST series servos
+please change the appropriate position, speed and delay parameters.
+*/
+
+#include <SCServo.h>
+
+SMS_STS st;
+
+// the uart used to control servos.
+// GPIO 18 - S_RXD, GPIO 19 - S_TXD, as default.
+#define S_RXD 18
+#define S_TXD 19
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial1.begin(1000000, SERIAL_8N1, S_RXD, S_TXD);
+  st.pSerial = &Serial1;
+  delay(1000);
+}
+
+void loop()
+{
+  st.WritePosEx(1, 4095, 3400, 50);//servo(ID1) speed=3400，acc=50，move to position=4095.
+  delay(2000);
+  
+  st.WritePosEx(1, 2000, 1500, 50);//servo(ID1) speed=3400，acc=50，move to position=2000.
+  delay(2000);
+}