Add README files to each package

packages/node_modules/@node-red/editor-api/README.md

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+@node-red/editor-api
+====================
+
+Node-RED editor api module.
+
+This provides an Express application that can be used to serve the Node-RED
+editor.
+
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).

packages/node_modules/@node-red/editor-client/README.md

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+@node-red/editor-client
+====================
+
+Node-RED editor resources module.
+
+This provides all of the client-side resources of the Node-RED editor application.
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).

packages/node_modules/@node-red/nodes/README.md

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+@node-red/nodes
+====================
+
+Node-RED core nodes module.
+
+This provides all of the core Node-RED nodes.
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).

packages/node_modules/@node-red/registry/README.md

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+@node-red/registry
+====================
+
+Node-RED node registry module.
+
+This provides the node registry, responsible for discovering and managing the node
+modules available to the Node-RED runtime.
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).

packages/node_modules/@node-red/runtime/README.md

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+@node-red/runtime
+====================
+
+Node-RED runtime module.
+
+This provides the core flow engine of Node-RED. It is the main entry point for
+the runtime.
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).

packages/node_modules/@node-red/util/README.md

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+@node-red/util
+====================
+
+Node-RED utilities module.
+
+This provides common utilities shared by the Node-RED components.
+
+### Source
+
+The main Node-RED modules are maintained as a monorepo on [GitHub](https://github.com/node-red/node-red).