script cleanup

Add .gitignore and DEVELOPMENT_GUIDE.md files; update README.md and s…

fix the LAYERSERIES_COMPAT_smart issue and add local rt-thread support.

- Introduced a new GitHub Actions workflow for manual builds, allowing users to select target machines.
- Updated README.md to include a badge for the manual build status, enhancing visibility of the build process.

Add manual build workflow and update README

Fix the rt-thread source folder issue and update README.md

- Removed explicit logging for detected region sources (Gitee/GitHub) to streamline output.
- Commented out the default logging message for detection failures, maintaining functionality while reducing verbosity.

- Introduced aarch64 and riscv64 patches to the BusyBox Makefile.
- Configured cross-compilation settings and optimized flags for both architectures.
- Updated include and library paths to support the respective SDKs.

- Introduced new machine configurations for K230 and RK3500, specifying kernel, U-Boot, and toolchain settings.
- Added a new machine class to handle architecture-specific settings and toolchain URLs for aarch64 and riscv64.
- Updated existing recipes to inherit the machine class and utilize the new toolchain handling logic for improved build processes.

- Simplified the display of common build commands by consolidating and reformatting the output.
- Removed redundant steps and organized the commands for better clarity and usability.

Add scripts for K230 and RK3500 machine.

Signed-off-by: Chen Wang <[email protected]>

Signed-off-by: Chen Wang <[email protected]>

doc: add description so people how where to change the MACHINE

ignore downloaded bitbake and oe-core