Add rough container type and runc runtime

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

process.go

@@ -0,0 +1,60 @@
+package containerkit
+
+import (
+	"errors"
+	"io"
+	"os"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+var (
+	ErrNotExecProcess = errors.New("containerkit: process not an exec process")
+)
+
+type ProcessDelegate interface {
+	Pid() int
+	Wait() (uint32, error)
+	Signal(os.Signal) error
+}
+
+type Process struct {
+	Stdin  io.Reader
+	Stdout io.Writer
+	Stderr io.Writer
+
+	exec bool
+	s    *specs.Process
+
+	driver ExecutionDriver
+	c      *Container
+	d      ProcessDelegate
+}
+
+func (p *Process) Spec() *specs.Process {
+	return p.s
+}
+
+func (p *Process) Start() error {
+	if !p.exec {
+		return ErrNotExecProcess
+	}
+	d, err := p.driver.Exec(p.c, p)
+	if err != nil {
+		return err
+	}
+	p.d = d
+	return nil
+}
+
+func (p *Process) Pid() int {
+	return p.d.Pid()
+}
+
+func (p *Process) Wait() (uint32, error) {
+	return p.d.Wait()
+}
+
+func (p *Process) Signal(s os.Signal) error {
+	return p.d.Signal(s)
+}