added README

README.md

-# arch-boxes
\ No newline at end of file
+# arch-boxes
+
+Arch-boxes provides automated builds of the Arch Linux releases for
+different providers and post-processors. Check the providers or post-processor sections if you want to know
+which are currently supported.
+
+## Dependencies
+
+You'll need the following dependencies:
+
+* packer (for basic usage)
+* vagrant (for vagrant images)
+* qemu (for libvirt provider support)
+* virtualbox (for virtualbox support)
+
+## How to start the build process
+
+On Arch Linux:
+
+`packer-io build vagrant.json`
+
+On any other System:
+
+`packer build vagrant.json`
+
+**Note:** this is because of the name conflict with the AUR-Helpertool
+`packer` on Arch linux.
+
+## providers
+
+* virtualbox-iso
+* qemu/libvirt
+
+## post-processors
+
+* vagrant
+
+## Troubleshooting
+
+### Parallel build fails
+If the parallel build fails this is mostly because the KVM device is
+already occupied by a different provider. You can use the build option
+`parallel=false` for building the images in a queue instead of parallel.
+But don't be surprised that that the build process will take longer. Any
+other option is to disable KVM support for all other providers except
+one.
+
+Start `packer` with `-parallel=false`:
+
+On Arch Linux:
+
+`packer-io build -parallel=false vagrant.json`
+
+On any other system:
+
+`packer build -parallel=false vagrant.json`