added api to clear browser cache

contextAPI.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const {contextBridge, ipcRenderer} = require("electron");
+const {contextBridge, ipcRenderer, webFrame} = require("electron");
 
 let fileOpenListener = null;
 
@@ -14,5 +14,7 @@ contextBridge.exposeInMainWorld("api", {
 	},
 	openFile       : filePath => ipcRenderer.send("WindowManager::openFile", filePath),
 
-	removeOnFileOpenListener : callback => ipcRenderer.off("Ation::openFile", callback)
+	removeOnFileOpenListener : callback => ipcRenderer.off("Ation::openFile", callback),
+
+	clearCache : () => webFrame.clearCache()
 });