Update README.md

Author: FasagidagRC

README.md

@@ -1,2 +1,50 @@
 # cryptoauthlib_rpi_handler
 A handler to use atecc chip library on Raspberry Pi
+
+
+# Prerequests
+Connect the ATECC608 to the Raspberry Pi.
+
+Enable I2C on the Raspberry Pi;
+
+  ```
+  sudo raspi-config
+  ```
+- Go to Interfacing Options
+- Select I2C and enable it
+
+```
+sudo apt-get install -y i2c-tools
+```
+then reboot device
+```
+sudo reboot
+```
+
+Install the ATECC608 Library:
+```
+sudo apt-get install -y libssl-dev
+git clone https://github.com/MicrochipTech/cryptoauthlib.git
+cd cryptoauthlib
+mkdir build
+cd build
+cmake -DATCA_HAL_I2C=ON -DATCA_I2C_IFACE=ON ..
+make
+sudo make install
+```
+
+Use i2cdetect to verify the ATECC608 is detected:
+```
+sudo i2cdetect -y 1
+```
+Ensure you have the correct I2C address. The default for the ATECC608 is usually 0xC0 (7-bit address 0x60).
+
+# Build Project
+
+```
+git clone git@github.com:RiddleAndCode/cryptoauthlib_rpi_handler.git
+mkdir build
+cd build
+cmake ..
+make
+```