Include Calls (#720)

* Get Call module

* The call event

* Update onCall index.d.ts

src/structures/Call.js

@@ -0,0 +1,68 @@
+'use strict';
+
+const Base = require('./Base');
+
+/**
+ * Represents a Call on WhatsApp
+ * @extends {Base}
+ */
+class Call extends Base {
+    constructor(client, data) {
+        super(client);
+
+        if (data) this._patch(data);
+    }
+
+    _patch(data) {
+        /**
+         * Call ID
+         * @type {string}
+         */
+        this.id = data.id;
+        /**
+         * From
+         * @type {string}
+         */
+        this.from = data.peerJid;
+        /**
+         * Unix timestamp for when the call was created
+         * @type {number}
+         */
+        this.timestamp = data.offerTime;
+        /**
+         * Is video
+         * @type {boolean}
+         */
+        this.isVideo = data.isVideo;
+        /**
+         * Is Group
+         * @type {boolean}
+         */
+        this.isGroup = data.isGroup;
+        /**
+         * Indicates if the call was sent by the current user
+         * @type {boolean}
+         */
+        this.fromMe = data.outgoing;
+        /**
+         * Indicates if the call can be handled in waweb
+         * @type {boolean}
+         */
+        this.canHandleLocally = data.canHandleLocally;
+        /**
+         * Indicates if the call Should be handled in waweb
+         * @type {boolean}
+         */
+        this.webClientShouldHandle = data.webClientShouldHandle;
+        /**
+         * Object with participants
+         * @type {object}
+         */
+        this.participants = data.participants;
+        
+        return super._patch(data);
+    }
+    
+}
+
+module.exports = Call;