Add skeleton of new libpod API

Signed-off-by: Matthew Heon <mheon@redhat.com>

libpod/ctr/container.go

@@ -0,0 +1,61 @@
+package ctr
+
+import (
+	"fmt"
+)
+
+var (
+	// ErrNotImplemented indicates that functionality is not yet implemented
+	ErrNotImplemented = fmt.Errorf("NOT IMPLEMENTED")
+)
+
+// Container is a single OCI container
+type Container struct {
+	// TODO populate
+}
+
+// Create creates a container in the OCI runtime
+func (c *Container) Create() error {
+	return ErrNotImplemented
+}
+
+// Start starts a container
+func (c *Container) Start() error {
+	return ErrNotImplemented
+}
+
+// Stop stops a container
+func (c *Container) Stop() error {
+	return ErrNotImplemented
+}
+
+// Kill sends a signal to a container
+func (c *Container) Kill(signal uint) error {
+	return ErrNotImplemented
+}
+
+// Exec starts a new process inside the container
+// TODO does this need arguments?
+// TODO should this return anything besides error?
+func (c *Container) Exec() error {
+	return ErrNotImplemented
+}
+
+// Attach attaches to a container
+// TODO does this need arguments?
+// TODO should this return anything besides error?
+func (c *Container) Attach() error {
+	return ErrNotImplemented
+}
+
+// Mount mounts a container's filesystem on the host
+// The path where the container has been mounted is returned
+func (c *Container) Mount() (string, error) {
+	return "", ErrNotImplemented
+}
+
+// Status gets a container's status
+// TODO this should return relevant information about container state
+func (c *Container) Status() error {
+	return ErrNotImplemented
+}