Add a standard basic context menu options

Author: pimterry

package-lock.json

@@ -79,6 +79,7 @@
   },
   "dependencies": {
     "electron-compile": "^6.4.4",
+    "electron-context-menu": "^0.10.1",
     "electron-squirrel-startup": "^1.0.0",
     "tslib": "^1.4.0"
   },

package.json

@@ -3,6 +3,11 @@ import * as os from 'os';
 import * as path from 'path';
 import { app, BrowserWindow, shell } from 'electron';
 
+import * as registerContextMenu from 'electron-context-menu';
+registerContextMenu({
+    showSaveImageAs: true
+});
+
 const packageJson = require('../package.json');
 
 const isWindows = os.platform() === 'win32';