feat(lets-cooee): add event observer and installation documentation (#4278)

* feat(Cooee): add Cooee plugin

* chore(Cooee): update document

* Update index.ts

* feat(lets-cooee): add event observable

* docs(lets-cooee): add lets-cooee documentation

Co-authored-by: Daniel Sogl <daniel@sogls.de>

docs/plugins/lets-cooee/README.md

@@ -0,0 +1,38 @@
+# Ionic Plugin for Cooee SDK
+
+## What is Cooee?
+
+Let’s Cooee powers hyper-personalized and real time engagements for mobile apps based on machine learning. The SaaS platform, hosted on
+cloud infrastructure processes millions of user transactions and data attributes to create unique and contextual user engagement
+triggers for end users with simple SDK integration that requires no coding at mobile app level.
+
+For more information visit our [website](https://www.letscooee.com/) and [documentation](https://docs.letscooee.com/developers/cordova/quickstart).
+
+## Features
+
+1. Plug and Play - Plugin is plug and play for mobile applications. That means it needs to be initialized with the Application Context, and it
+   will work automatically in the background.
+2. Independent of Application - Plugin is independent of the application. It will collect data points with zero interference from/to the
+   applications. Although applications can send additional data points (if required) to the Plugin using API’s.
+3. Rendering engagement triggers - Plugin will render the campaign trigger at real-time with the help of server http calls.
+
+## Platforms
+
+- Android (Minimum Android 5.0 / API level 21)
+- iOS (Minimum deployment target iOS 13)
+
+## Installation
+
+```
+$ ionic cordova plugin add @letscooee/cordova-plugin --variable COOEE_APP_ID="MY_COOEE_APP_ID"
+$ npm install @awesome-cordova-plugins/lets-cooee
+```
+Replace `MY_COOEE_APP_ID` with the `App ID` which is present at [Cooee Portal](https://dashboard.letscooee.com/app/details).
+
+## Usage Documentation
+
+For detailed installation & uses, Refer [Cordova](https://docs.letscooee.com/developers/cordova/quickstart) documentation.
+
+Plugin Repo: [https://github.com/letscooee/cordova-plugin-cooee](https://github.com/letscooee/cordova-plugin-cooee)
+
+Requires Cordova plugin: `@letscooee/cordova-plugin` [![npm](https://img.shields.io/npm/v/@letscooee/cordova-plugin)](https://www.npmjs.com/package/@letscooee/cordova-plugin).

src/@awesome-cordova-plugins/plugins/lets-cooee/index.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@angular/core';
 import { Plugin, Cordova, AwesomeCordovaNativePlugin } from '@awesome-cordova-plugins/core';
+import { Observable } from 'rxjs';
 
 /**
  * @name Lets Cooee
@@ -72,4 +73,17 @@ export class Cooee extends AwesomeCordovaNativePlugin {
   getUserID(): Promise<any> {
     return;
   }
+
+  /**
+   * Provides callback for the onCooeeCTAListener event.
+   * @return {Observable<Any>} Returns an observable record.
+   */
+  @Cordova({
+    eventObservable: true,
+    event: 'onCooeeCTAListener',
+    element: document,
+  })
+  addCooeeCTAListener(): Observable<any> {
+    return;
+  }
 }