added footer with version

src/presentation/TheFooter.vue

@@ -0,0 +1,31 @@
+<template>
+    <div id="footer">
+        {{text}}
+    </div>
+</template>
+
+<script lang="ts">
+import { Component, Prop, Vue } from 'vue-property-decorator';
+import { StatefulVue } from './StatefulVue';
+
+@Component
+export default class TheFooter extends StatefulVue {
+  private text: string = '';
+
+  public async mounted() {
+    const state = await this.getCurrentStateAsync();
+    this.text = `v${state.app.version}`;
+  }
+}
+</script>
+
+<style scoped lang="scss">
+@import "@/presentation/styles/colors.scss";
+@import "@/presentation/styles/fonts.scss";
+#footer {
+    color: $gray;
+    font-size: 0.7em;
+    font-family: $artistic-font;
+    text-align: center;
+}
+</style>