add readonly property

src/app/files/basicReadOnlyExplorer.js

@@ -6,6 +6,7 @@ class BasicReadOnlyExplorer {
     this.event = new EventManager()
     this.files = {}
     this.type = type
+    this.readonly = true
   }
 
   close (cb) {

src/app/files/file-explorer.js

@@ -216,6 +216,7 @@ function fileExplorer (appAPI, files) {
   }
 
   function editModeOn (event) {
+    if (self.files.readonly) return
     var label = this
     var li = getLiFrom(label)
     var classes = li.className