add silksong path saving

preload.js

@@ -1,7 +1,14 @@
-const { contextBridge } = require('electron')
+const { contextBridge, ipcRenderer } = require('electron')
 
 contextBridge.exposeInMainWorld('versions', {
   node: () => process.versions.node,
   chrome: () => process.versions.chrome,
   electron: () => process.versions.electron
+})
+
+contextBridge.exposeInMainWorld('save', {
+  saveSilksongPath: (path) =>
+    ipcRenderer.invoke('save-path', path),
+  loadSilksongPath: () =>
+    ipcRenderer.invoke('load-path')
 })