ADD: filterinput component

frontend/src/components/FilterInput.vue

+<template>
+  <div class="net-filter-direct d-print-none">
+    <b-input-group class="shadow">
+      <b-input-group-prepend>
+        <b-input-group-text>
+          <font-awesome-icon :icon="['fas', 'filter']"/>
+        </b-input-group-text>
+      </b-input-group-prepend>
+      <b-input debounce="300" v-model="value" @update="$emit('input', $event)" class="search form-control"
+               placeholder="Filter"
+               autofocus/>
+      <b-input-group-append v-if="allow_direct">
+        <b-button title="Direktwahl" variant="outline-secondary" type="submit"
+                  class="mr-0">
+          <font-awesome-icon icon="arrow-right"/>
+        </b-button>
+      </b-input-group-append>
+    </b-input-group>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'FilterInput',
+  props: {
+    allow_direct: {
+      default() {
+        return false
+      }
+    },
+    value: {
+      default() {
+        return ''
+      }
+    }
+  }
+}
+</script>
+
+<style scoped>
+
+</style>