added some libs and projects

I2C_SLAVE_PHOTORESISTOR/I2C_SLAVE_PHOTORESISTOR.ino

@@ -0,0 +1,22 @@
+
+#include <Wire.h>
+
+int lightPin = 0;
+
+void setup()
+{
+  Wire.begin(7); // join i2c bus with address #7
+  Wire.onRequest(requestEvent); // register event
+  Serial.begin(9600); //Begin serial communcation
+}
+
+void loop()
+{
+  Serial.println(analogRead(lightPin));
+  delay(1000);
+}
+
+void requestEvent()
+{
+  Wire.write(analogRead(lightPin)); // respond with message of 6 bytes
+}