Need a README how to use the .dts, .its files to generate a usable artifact

[sbanerjee-quic]

@quic-kaushalk this repo needs a README markdown for users to understand how they can use .dts, .its files to generate a usable artifact and how this can be deployed on a qualcomm-linux enabled dev board.

[sbanerjee-quic]

@quic-kaushalk reminder to expand README.md to capture steps how a user can

1. clone this repo
2. what tools should be used along with an input its to generate FIT image
3. Which DTB files from kernel build to use?
4. how to deploy the generated DTB to device?

Standalone workflow in the README is needed for users who want to update DT without relying on distro specific build that meta-qcom provdes.