Add README.md.

README.md

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+# Project Name: gardenlinux/package-build
+
+## Description
+This project is part of the gardenlinux organization on GitHub and focuses on package building for GardenLinux system.
+
+It contains:
+- `bin/`: This folder contains executable scripts installs into the container.
+- `container/`: This folder contains container-related files that define images and configurations.
+  - `*.containerfile`: These files define container images.
+  - `conf/`: This folder contains configuration files for containers configurations.
+- `conf/`: This folder contains general configuration files.
+- `misc/`: This folder contains miscellaneous files related to the project.
+- `scripts/`: This folder contains scripts for it's github actions workflow.
+