Add guideline button

frontend/components/tasks/toolbar/buttons/ButtonGuideline.vue

@@ -0,0 +1,16 @@
+<template>
+  <v-tooltip bottom>
+    <template v-slot:activator="{ on }">
+      <v-btn
+        icon
+        v-on="on"
+        @click="$emit('click:guideline')"
+      >
+        <v-icon>
+          mdi-book-open-outline
+        </v-icon>
+      </v-btn>
+    </template>
+    <span>{{ $t('annotation.guidelineTooltip') }}</span>
+  </v-tooltip>
+</template>