Added build instructions

docs/build.md

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+# Build Procedures
+To deploy this project there are a certain steps that need to be followed. 
+You build the images on a powerfull windows computer with WSL or a Linux computer. 
+Then you transfer them to your less powerfull Companion PC to run the code there.
+
+## On WSL or Linux
+### Install Docker
+First you need to make sure you have installed docker on the machine. 
+You can do this by following this tutorial: [Install Docker](https://docs.docker.com/engine/install/ubuntu/). 
+
+### Install QEMU
+To be able to build multiplatform images,  another tool is needed. This tool is called QEMU. 
+You can install by running the following commands.
+```bash
+sudo apt install qemu-user-static
+```
+
+### Clone the repository
+Clone the repository so we have acces to the buildtools. 
+And so we also have access to the source code. You also might need to create a build dir. 
+You can do this form autopilot/buildtools/build. 
+
+### Build images
+You can easily build the images with the build scripts provided. 
+Make sure your in the autopilot directory when you run them. 
+This build process is quite heavy. Make sure you have atleast 16GB RAM & 8 Threads. 
+```bash
+# ... = linux/arm64 or linux/amd64
+./buildtools/build.sh -p ...
+```
+The resulted files are saved in the .tar format. They are not compressed. 
+
+### Transfer images
+To tranfer the images make sure you select the platform you want to transfer. 
+Make sure your in the autopilot directory when you run them. 
+```bash
+# ... = linux/arm64 or linux/amd64
+# ... = wsl or linux
+./buildtools/transfer.sh -p ... -t ...
+```
+The -t says what type of tranfser to use either scp for windows or rsync for linux. 
+
+## On Companion PC
+### Install Docker
+First you need to make sure you have installed docker on the machine. 
+You can do this by following this tutorial: [Install Docker](https://docs.docker.com/engine/install/ubuntu/).
+
+### Clone the repository
+Clone the repository so we have acces to the buildtools. You also might need to create a build dir. 
+You can do this form autopilot/buildtools/build. 
+
+### Unpack images
+To tranfer the images make sure you select the platform you want to transfer. 
+Make sure your in the autopilot directory when you run them. 
+```bash
+./buildtools/unpack.sh
+```
+The -t says what type of tranfser to use either scp for windows or rsync for linux.