added inital project readme witrh arduino code

Author: Moritz Spindelhirn

README.md

@@ -0,0 +1,47 @@
+# Proxy for serial connection to arduino
+
+Works with the following arduino code.  
+I tried to comment it as well as possible but it is still not as stable and genric as it could be.
+
+```c
+void setup() {
+  pinMode(3, OUTPUT);
+  // ... set all pins
+  
+  // you can change baudrate if you will. app starts with a setup screen
+  Serial.begin(9600);
+}
+
+void loop() {
+  // protocol defines requests always in 3 bytes
+  if (Serial.available() > 2) {
+    // read the incoming bytes
+    int type = Serial.read();
+    int port = Serial.read();
+    int spower = Serial.read();
+
+    if (type == 1) {
+      Serial.write(3);
+      // ... write each pin that is connected out here
+      
+      // 0 byte as end marker
+      Serial.write(0);
+    } else if(type == 2) {
+      // check if port is valid pin
+      if (port == 3) { 
+        // set pwm freq
+        analogWrite(port, spower);
+        
+        Serial.write(1); // first answer byte is status 0||1
+        Serial.write(0); // 0 byte as end marker
+        return;
+      }
+      Serial.write(0); // first answer byte is status 0||1
+      Serial.write(0); // 0 byte as end marker 
+    } else {
+      Serial.write(0); // first answer byte is status 0||1
+      Serial.write(0); // 0 byte as end marker
+    }
+  }
+}
+```