First draft of BUILD.md

BUILD.md

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+# Build Instructions
+
+Instructions for building this repository on Linux.
+
+## Table Of Contents
+
+- [Build Instructions](#build-instructions)
+  - [Table Of Contents](#table-of-contents)
+  - [Contributing to the Repository](#contributing-to-the-repository)
+  - [Building On Linux](#building-on-linux)
+    - [Linux Development Environment Requirements](#linux-development-environment-requirements)
+      - [Required Package List](#required-package-list)
+      - [Install and prepare required Rust version](#install-and-prepare-required-rust-version)
+      - [Required MacOSX Sdk](required-macosx-sdk)
+        - [Build and use MacOS Sdk from XCode](build-and-use-macos-sdk-from-xcode)
+      - [Build the Project](#build-the-project)
+
+## Contributing to the Repository
+
+If you intend to contribute, the preferred work flow is for you to develop
+your contribution in a fork of this repository in your GitHub account and then
+submit a pull request.
+
+## Repository Content
+
+This repository contains the source code necessary to build warp-packer for different platforms and architecture.
+
+## Building On Linux
+
+### Linux Development Environment Requirements
+
+This repository has been built and tested on Debian 12.5 (Bookworm) on an AMD64 architecture.
+
+#### Required Package List
+
+`apt install curl maven clang cmake libssl-dev zlib1g-dev liblzma-dev libbz2-dev gcc-aarch64-linux-gnu gcc-mingw-w64-x86-64-win32`
+
+#### Install and prepare required Rust version
+
+This repository has been built and tested with rust version 1.78.
+
+To install the newest version, run the following command:
+`curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh`
+
+If newer version won't work, a specific version can be used with the following command:
+`$ curl --proto '=https' --tls1.2 -sSf https://sh.rustup.rs/ | sh -s --default-toolchain=1.78.0`
+
+For more information see this [Github Issue](https://github.com/rust-lang/rustup/issues/2882).
+
+After install run the following commands to get the necessary targets:
+`rustup target add x86_64-apple-darwin`
+`rustup target add aarch64-unknown-linux-gnu`
+`rustup target add x86_64-pc-windows-gnu`
+
+#### Required MacOSX Sdk
+
+To build the warp-packer for the target x86_64-apple-darwin a MacOSX Sdk is needed. The repository has been build and tested with MacOSX10.12 Sdk.
+There are seveal Github repository available that contains different Sdk versions but they all seems to miss the header files. So it is recommend to download it from apples websites.
+The MacOS Sdk is integrated in XCode and this repository has been build and tested with Xcode version 8.3.3.
+
+##### Build and use MacOS Sdk from XCode
+
+To build and use the MacOS Sdk from XCode [osxcross](https://github.com/tpoechtrager/osxcross) will be used.
+
+Download osxcross:
+`git clone https://github.com/tpoechtrager/osxcross.git`
+
+Extract MacOS Sdk from XCode (see [here](https://github.com/tpoechtrager/osxcross?tab=readme-ov-file#packing-the-sdk-on-linux---method-1-xcode--80):
+`<path/to>/osxcross/tools/gen_sdk_package_pbzx.sh <path/to>/Xcode_8.3.3.xip`
+Hint: This method may require up to 45 GB of free disk space.
+An SSD is recommended for this method.
+
+Copy or move the SDK into the `<path/to>/osxcross/tarballs/` directory.
+
+Run:
+`UNATTENDED=yes OSX_VERSION_MIN=10.12 ./build.sh` to create macOS cross toolchain.
+
+Add the target/bin folder to your PATH environment variable:
+`PATH="<path/to>/osxcross/target/bin:$PATH"`
+
+#### Build the Project
+
+Clone the project and within the project run
+`make`
+to start the build.
+
+The compiled warp-packer files are in the folder:
+`<path/to/>warp/target/<target>/release/warp-packer`
+e.g.
+`warp/target/aarch64-unknown-linux-gnu/release/warp-packer`