added missing link (#21)

added missing link from https://www.arduino.cc/en/Reference/ArduinoLSM9DS1 @karlsoderby

Author: jhansson-ard

docs/readme.md

@@ -1,6 +1,6 @@
 # ArduinoLSM9DS1 library
 
-The ArduinoLSM9DS1 library allows you to use the inertial measurement unit (IMU) available on the Arduino® Nano 33 BLE board. The IMU is a LSM9DS1, it is a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer. The IMU is connected to the Nano 33 BLE board's microcontroller through I2C. The values returned are signed floats.
+The ArduinoLSM9DS1 library allows you to use the inertial measurement unit (IMU) available on the Arduino® Nano 33 BLE board. The IMU is a [LSM9DS1](https://www.st.com/resource/en/datasheet/lsm9ds1.pdf), it is a 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer. The IMU is connected to the Nano 33 BLE board's microcontroller through I2C. The values returned are signed floats.
 
 To use this library:
 
@@ -14,4 +14,4 @@ The ArduinoLSM9DS1 library takes care of the sensor initialization and sets its
 - Gyroscope range is set at ±2000 dps with a resolution of 70 mdps.
 - Magnetometer range is set at ±400 uT with a resolution of 0.014 uT.
 - Accelerometer and gyrospcope output data rate is fixed at 104 Hz.
-- Magnetometer output data rate is fixed at 20 Hz.
+- Magnetometer output data rate is fixed at 20 Hz.