Update README.md

README.md

+# NVIDIA Jetson Xavier NX Setup
+
+Below are the steps required to set up a stock Jetson to use this code base:
+
+* Set up the SD card to have an OS on it, either by:
+    - Using NVIDIA's set up proceedure found [here](https://developer.nvidia.com/embedded/learn/get-started-jetson-xavier-nx-devkit#prepare), which then would require a lot of installations/additional set up (OpenCV, Ros, etc.).
+    - Using the CAS Lab's own images found `[TBD]`.
+
+* If using the NVIDIA option a few more things need to be configured:
+    - Follow the steps listed in the DJI Onboard SDK software set up page [here](https://developer.dji.com/onboard-sdk/documentation/development-workflow/environment-setup.html) (also can be helpful for debugging, a complete list of vehicle activation checks can be found [here](https://forum.dji.com/thread-216529-1-1.html))
+    - The udev rules file is slightly different than what DJI suggests, this is because the USB device name needs to be static so it can be found every time. The udev file contents below is designed for use with [this](https://www.adafruit.com/product/954) USB device. To use a different device the `idVendor` field can be found by inspecting `dmesg` or `lsusb`
+
+* The hosts and hostname will need to be configured regardless of the image source
+    - The `/etc/hosts` template, listed below, makes it easier to ssh into the Jetson and launch ROS nodes.
+    - The `/etc/hostname` file holds the 
+
+### UDEV Rules File
+
+The udev rules contents, to be placed in `/etc/udev/rules.d/DJIDevice.rules`, is listed below
+
+`SUBSYSTEM=="usb", ATTRS{idVendor}=="2ca3", MODE="0666"
+SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea60", SYMLINK+="dji_usb"`
+
+### Hosts File
+
+The hosts contents, to be placed in `/etc/hosts` is listed below
+
+`
+127.0.0.1       localhost
+192.168.1.100   pop-os
+192.168.1.230   pop-os
+127.0.0.1       yeats
+192.168.1.101   neruda
+192.168.1.191   nerudaHouse
+192.168.1.102   plath
+192.168.1.24    plathHouse
+192.168.1.103   yeats # --> your hostname here
+192.168.1.198   yeatsHouse
+
+
+# The following lines are desirable for IPv6 capable hosts
+::1     ip6-localhost ip6-loopback
+fe00::0 ip6-localnet
+ff00::0 ip6-mcastprefix
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
+`
+
+---
+
+## Hardware Setup
+
+Proceedure for drone-Jetson communication is found [here](https://developer.dji.com/onboard-sdk/documentation/development-workflow/hardware-setup.html) note details on Advanced Sensing as they are required to use drone cameras.
+
+
+## Debugging
+
+Why it doesn't work?? 
+
+### Vehicle Activation Errors
+
+Check [here](https://forum.dji.com/thread-216529-1-1.html).
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