Added base folder structure for Newsfeed plugin

x-pack/plugins/newsfeed/kibana.json

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+{
+  "id": "newsfeed",
+  "version": "kibana",
+  "server": false,
+  "ui": true
+}

x-pack/plugins/newsfeed/public/index.ts

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+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { PluginInitializerContext } from '../../../../src/core/public';
+import { NewsfeedPublicPlugin } from './plugin';
+
+export function plugin(initializerContext: PluginInitializerContext) {
+  return new NewsfeedPublicPlugin(initializerContext);
+}
+
+export { NewsfeedPublicPlugin as Plugin };

x-pack/plugins/newsfeed/public/plugin.ts

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+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import {
+  PluginInitializerContext,
+  CoreSetup,
+  CoreStart,
+  Plugin,
+} from '../../../../src/core/public';
+
+export type Setup = void;
+export type Start = void;
+
+export class NewsfeedPublicPlugin implements Plugin<Setup, Start> {
+  constructor(initializerContext: PluginInitializerContext) {}
+
+  public setup(core: CoreSetup): Setup {}
+
+  public start(core: CoreStart): Start {}
+}