Add usage docs

Usage.md

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+# Usage
+
+## Function for Function
+
+### `Servo my_servo(int,int)`
+
+This creates a new instance of a servo the two int are the pins.
+
+
+### `begin()`
+
+Sets both pins as out and sets them low.
+
+### `position(int)`
+
+Sets the position to one of three values they mean:
+
+0=Neutral position
+
+1=The first non Neutral position
+
+2=The second non Neutral position
+
+## Example 
+
+```
+#include <lego_servo.h>
+
+Servo my_servo(2,3);
+// Creates a new servo called my_servo on pin 2 and 3
+void setup() {
+  my_servo.begin();
+  // Sets the pins to an OUTPUT and LOW
+}
+
+void loop()
+  my_servo.position(1);
+  //  Go to position one
+  delay(1000);
+  
+  my_servo.position(2);
+  // Go to position two
+  delay(1000);
+
+  my_servo.position(0);
+  // Go to neutral position
+  delay(1000);
+} 
+
+```