Do not show workspace placeholder on folders without create permissions

The workspace placeholder is shown if there is no "Readme.md" file in
the folder and invites the user to add some text, which (tries to)
create the "Readme.md" file. Therefore, if the user does not have create
permissions on the folder the placeholder should not be shown.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

src/views/RichWorkspace.vue

@@ -22,7 +22,7 @@
 
 <template>
 	<div v-if="enabled" id="rich-workspace" :class="{'icon-loading': !loaded || !ready, 'focus': focus, 'dark': darkTheme }">
-		<div v-if="!file || (autofocus && !ready)" class="empty-workspace" @click="createNew">
+		<div v-if="showEmptyWorkspace" class="empty-workspace" @click="createNew">
 			<p class="placeholder">
 				{{ t('text', 'Add notes, lists or links …') }}
 			</p>
@@ -80,6 +80,12 @@ export default {
 		shareToken() {
 			return document.getElementById('sharingToken') ? document.getElementById('sharingToken').value : null
 		},
+		canCreate() {
+			return !!(this.folder && (this.folder.permissions & OC.PERMISSION_CREATE))
+		},
+		showEmptyWorkspace() {
+			return (!this.file || (this.autofocus && !this.ready)) && this.canCreate
+		},
 	},
 	watch: {
 		path: function() {