Doc: Add definitions of terms

docs/proposals/00_openyurt-glossary.md

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+# Table of Contents
+
+This document lists terms for the OpenYurt implementation.
+
+[C](#c) | [E](#e) | [N](#n) | [U](#u) | [Y](#y)
+
+## C
+---
+
+### CloudNode
+
+The node that runs on the cloud. The control-plane and other cluster management components are usually running on the CloudNode.
+
+## E
+---
+
+### EdgeNode
+
+The node that is accessible to the edge device. The EdgeNodes are usually located in a sub-optimal network environment. They may be disconnected from the cloud node at any time.
+
+### End User
+
+Represents a user of the OpenYurt cluster.
+
+## N
+---
+
+### NodePool
+
+The CRD represents a pool of edge nodes in the same network region.
+
+## U
+---
+
+### UnitedDeployment
+
+The CRD defines the way of deploying homogeneous workloads with different versions/configurations by NodePools.
+
+## Y
+---
+
+### YurtControllerManager
+
+Controller Manager for OpenYurt like Kube Controller Manager for K8s, and include nodelifecycle controller at present, more controllers will be added in the future.
+
+### YurtHub
+
+A reverse proxy and cache response on local disk. when cloud-edge network is normal, forward the requests from edge to cloud, and when cloud-edge network is disconnected, the local cache is returned to edge client.
+
+### YurtTunnel
+
+The network tunnel helps CloudNodes to send HTTP requests to EdgeNodes located in an isolated network.
+
+### YurtTunnel Server
+
+The server of the YurtTunnel runs on each CloudNode and redirects HTTP requests to corresponding agents.
+
+### YurtTunnel Agent
+
+The agent of the YurtTunnel that runs on each EdgeNode receives requests from the YurtTunnel Server and sends requests to destination hosts.
+
+### YurtAppManager
+
+The controller manager includes the NodePool Controller and the UnitedDeployment Controller.