start of gitbook implementation

docs/ReactiveOptions.md

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+### Reactive Options
+
+When the list of options provided by the parent changes, vue-select will react as you'd expect.
+
+<div style="margin-top:0;" class="radio">
+  <label>
+    <input type="radio" name="reactive-options" v-model="reactive" :value="countries">
+    `<v-select :options="countries"></v-select>`
+  </label>
+</div>
+
+<div class="radio">
+  <label>
+    <input type="radio" name="reactive-options" v-model="reactive" :value="['foo','bar','baz']">
+    `<v-select :options="['foo','bar','baz']"></v-select>`
+  </label>
+</div>
+
+<v-select :options="reactive"></v-select>