Added doxygen docs deployement badge to readme

Author: chrisdedman

README.md

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 # AstraKernel ~ A minimal ARM kernel for QEMU
 
 [![GitHub release (including pre-releases)](https://img.shields.io/github/v/release/sandbox-science/AstraKernel?include_prereleases)](https://github.com/sandbox-science/AstraKernel/releases)
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 AstraKernel is a minimal experimental kernel written in modern C and ARM assembly, designed to run on
 **QEMU’s Versatile AB/PB board with a Cortex‑A8 CPU override (-cpu cortex-a8)**. This setup keeps the