Use configuration file for tests instead of hardcoded kernel/qcow2 path

README.md

@@ -1,2 +1,43 @@
 # go-qemu-kernel
+
 Qemu wrapper for kernel-related CI tasks
+
+## Usage
+
+TODO
+
+## Development
+
+    $ go get github.com/jollheef/go-qemu-kernel
+
+### Generate root image
+
+First of all we need to generate rootfs for run qemu.
+
+#### GNU/Linux
+
+    $ sudo apt install -y debootstrap qemu
+    $ sudo qemu-debian-img generate sid.img
+
+#### macOS
+
+Note: qemu on macOS since v2.12 (24 April 2018) supports Hypervisor.framework.
+
+    $ brew install qemu
+
+Because it's a very complicated to debootstrap qemu images from macOS,
+preferred way is to use Vagrant with any hypervisor.
+
+    $ brew cask install vagrant
+    $ cd $GOPATH/src/github.com/jollheef/go-qemu-kernel/tools/qemu-debian-image
+    $ vagrant up && vagrant destroy -f
+
+bionic.img and bionic-vmlinuz will be created in current directory.
+
+### Fill configuration file
+
+    $ $EDITOR $GOPATH/src/github.com/jollheef/go-qemu-kernel/test.config.go
+
+### Run tests
+
+    $ go test -v