Add example code for bitWrite

Language/Functions/Bits and Bytes/bitWrite.adoc

@@ -42,6 +42,32 @@ Nothing
 // OVERVIEW SECTION ENDS
 
 
+// HOW TO USE SECTION STARTS
+[#howtouse]
+--
+
+[float]
+=== Example Code
+Demonstrates the use of bitWrite by printing the value of a variable to the Serial Monitor before and after the use of `bitWrite()`.
+
+
+[source,arduino]
+void setup() {
+  Serial.begin(9600);
+  while (!Serial) {}  // wait for serial port to connect. Needed for native USB port only
+  byte x = 0b10000000;  // the 0b prefix indicates a binary constant
+  Serial.println(x, BIN); // 10000000
+  bitWrite(x, 0, 1);  // write 1 to the least significant bit of x
+  Serial.println(x, BIN); // 10000001
+}
+
+void loop() {}
+----
+[%hardbreaks]
+--
+// HOW TO USE SECTION ENDS
+
+
 // SEE ALSO SECTION
 [#see_also]
 --