Add start of roadmap for the project

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

ROADMAP.md

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+# containerd roadmap
+
+This is a high level roadmap for the project that outlines what is currently being worked on, what comes next, and where you can help.
+
+The following are the different status the various phases of development can be in:
+* Not Started - no work or thinking has been done towards the goal
+* In Design - design work has started for the component and you can find design documents in the `design` folder
+* In Progress - design has mostly finished and development has started
+* Completed - the development work has been completed
+* Stable - the apis for the phase are feature complete and considered stable
+
+## Phase 1
+
+#### Status: In Progress
+
+### GRPC API 
+
+**Document:**
+
+We are going from a top down design for filling out this missing pieces of containerd and design of the API.
+
+### Design
+
+**Document:** 
+
+The high level design work is needed so that the architecture of containerd stays consistent throughout the development process.
+
+### Build & Test Process
+
+**Document:**
+
+We need to have a simple build and test process for new developers to bootstrap their environments.
+Because containerd will be the base of many high level systems we need to have a simple build process that does
+not require high level tooling.
+
+## Phase 2
+
+Phase 2 includes most of the design and development work for the execution and storage layers of containerd.
+It will include porting over existing "graph drivers" from Docker Engine and finding a common model for representing snapshots for layered filesystems.
+
+This will also include moving the existing execution code support OCI's Runtime Spec and the existing containerd execution code.
+
+#### Status: In Design
+
+### Execution
+
+### Storage
+
+**Document:** https://github.com/docker/containerkit/blob/master/design/snapshots.md
+
+## Phase 3
+
+Phase 3 involves porting the network drivers from libnetwork and finding a good middle ground between the abstractions of libnetwork and the CNI spec.
+
+This also includes getting support for the OCI Image spec built into containerd.
+
+#### Status: Not Started
+
+### Distribution
+
+### Networking
+
+## Phase 4
+
+Phase 4 includes work on helping with the releases and packaging of containerd for various distros.
+
+#### Status: Not Started
+
+### Release Process & Tools