Create CNI Proposal

Initial draft CNI proposal for editing with CNI maintainers

proposals/CNI Proposal

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+# Name of project: Container Networking Interface
+
+# Description
+The CNI (Container Network Interface) project consists of a specification and libraries for writing plugins to configure network interfaces
+in Linux containers, along with a number of supported plugins. CNI concerns itself only with network connectivity of containers and removing 
+allocated resources when the container is deleted. Because of this focus, CNI has a wide range of support and the specification is simple to 
+implement. CNI consists of 3 separate comonents:
+
+  *  CNI Specification: defines an straightforward API between runtimes and network plugins for container network setup/teardown.  No more, no less.
+  *  Plugins: provide network setup for a variety of use-cases and serve as reference examples of plugins conforming to the CNI specification
+  *  Library: provide a Go implementation of the CNI specification that runtimes can use to more easily consume CNI
+     NOTE: CNI Specification is independently versioned from the CNI library and plugins in the repository (e.g. the versions of releases). The plugins are being pulled out into a separate repository
+
+**Sponsor/Advisor from TOC:** Ken Owens
+
+**preferred maturity level:** Incubating
+
+**License:** Apache License v2.0
+
+**Source control repositories:** https://github.com/containernetworking/cni
+
+**external dependencies:** None
+
+**Initial Committers:** https://github.com/containernetworking/cni/graphs/contributors
+
+**infrastructure requests (CI / CNCF Cluster):** None
+
+**communication channels (slack, irc, mailing lists):** 
+  * Email: cni-dev
+  * IRC: #containernetworking channel on freenode.org
+  * Slack: containernetworking.slack.com
+
+**issue tracker (GitHub by default):** Github - https://github.com/containernetworking/cni/issues
+
+**website (current version will move to project.cncf.io):** https://github.com/containernetworking
+
+**release methodology and mechanics:**
+*TBD*
+
+**social media accounts**
+
+**community size and any existing sponsorship**
+  *  56 Contributors
+  *  591 Stars
+  *  17 releases
+  
+## Container runtimes
+
+rkt - container engine
+Kurma - container runtime
+Kubernetes - a system to simplify container operations
+Cloud Foundry - a platform for cloud applications
+Mesos - a distributed systems kernel
+
+## 3rd party plugins
+
+Project Calico - a layer 3 virtual network
+Weave - a multi-host Docker network
+Contiv Networking - policy networking for various use cases
+SR-IOV
+Cilium - BPF & XDP for containers
+Infoblox - enterprise IP address management for containers
+Multus - a Multi plugin
+Romana - Layer 3 CNI plugin supporting network policy for Kubernetes
+CNI-Genie - generic CNI network plugin