basic docs and demo for messagebox widget

config/messagebox.js

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+define({
+    isDebug: true,
+
+    mapOptions: {
+        basemap: 'streets',
+        center: [-96.59179687497497, 39.09596293629694],
+        zoom: 5,
+        sliderStyle: 'small'
+    },
+
+    titles: {
+        header: 'CMV MessageBox Widget',
+        subHeader: 'This is an example of Confirm and Alert MessageBoxes',
+        pageTitle: 'CMV MessageBox Widget'
+    },
+
+    panes: {
+        left: {
+            collapsible: false,
+            style: 'display:none'
+        }
+    },
+
+    operationalLayers: [],
+
+    widgets: {
+
+        // widget to create the MessageBox
+        messagebox: {
+            include: true,
+            id: 'messagebox',
+            type: 'invisible',
+            path: 'widgets/MessageBox',
+            options: {
+                nameSpace: 'app' // optional namespace
+            }
+        },
+
+        // simple widget to show how to open
+        // and respond to a message box
+        callMeAMessageBox: {
+            include: true,
+            id: 'callMeAMessageBox',
+            type: 'invisible',
+            path: 'dijit/_WidgetBase',
+            options: {
+                map: true,
+                startup: function () {
+                    // waiting a second. not normally needed when used in your code
+                    window.setTimeout(function () {
+
+                        // use the same namespace defined in the messagebox options above
+                        // can be called from anywhere in your code
+                        var mb = window.app.MessageBox;
+                        mb.confirm({
+                            title: 'Delete Feature?',
+                            content: 'Are you sure you want to delete this feature?<br/><br/>This action cannot be undone.'
+                        }).then(
+                            function (result) {
+                                // respond based on the results returned from the confirm MessageBox
+                                if (result === mb.okMessage) {
+                                    mb.alert({
+                                        title: 'Feature Deleted',
+                                        content: 'You chose to delete the feature.'
+                                    });
+                                } else if (result === mb.cancelMessage) {
+                                    mb.alert({
+                                        title: 'NOT Deleted',
+                                        content: 'You chose NOT to delete the feature.'
+                                    });
+                                }
+                            },
+                            function (/* result */) {}
+                        );
+                    }, 1000);
+                }
+            }
+        }
+    }
+});

widgets/MessageBox/README.md

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+#Message Box for CMV
+Show a modal Confirmation or Alert dialog box. Intended to be called from other widgets.
+
+---
+## Configurable Options
+
+| Parameter | Type | Description |
+| :----: | :--: | ----------- |
+| `nameSpace` | String | Default is null Optional Namespace. If omitted, the global window Namespace is used. |
+| `okMessage` | String | Default is 'MessageBox.OK'. |
+| `cancelMessage` | String | Default is 'MessageBox.Cancel'. |
+
+
+---
+## Example Configuration:
+``` javascript
+messagebox: {
+    include: true,
+    id: 'messagebox',
+    type: 'invisible',
+    path: 'widgets/MessageBox',
+    options: {
+        nameSpace: 'app' // optional namespace
+    }
+}
+```
+## Screenshot:
+![Screenshot](https://tmcgee.github.io/cmv-widgets/images/messagebox1.jpg)
+