Added cross compile scripts for ARM Cortex-M

[nayakned]

This should partly take care of #51

[Copilot]

Pull Request Overview

This PR adds support for cross-compiling for ARM Cortex-M by introducing a new toolchain file and updating CMake configurations. Key changes include:

• Adding branch conditions in src/CMakeLists.txt for library creation when not on Linux or Zephyr.
• Introducing a new arm-cortex-m.toolchain file to support ARM cross-compilation.
• Updating README.md and the root CMakeLists.txt to reference and integrate the new toolchain.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/CMakeLists.txt	Added additional branches for library creation in non-Linux/Zephyr cases.
arm-cortex-m.toolchain	New toolchain file to configure the build for ARM Cortex-M.
README.md	Documented the availability of the ARM Cortex-M toolchain file.
CMakeLists.txt	Adjusted example target inclusion based on the system name.

Comments suppressed due to low confidence (1)

arm-cortex-m.toolchain:5

• It appears that 'tripe' might be a typo. If the intent is to set the toolchain triple, the variable should likely be renamed accordingly.

set(tripe arm-none-eabi)