add info layer that shows info about current puzzle

src/frontend/components/InfoOverlay.vue

@@ -0,0 +1,68 @@
+<template>
+  <div class="overlay transparent" @click="$emit('bgclick')">
+    <table class="overlay-content help" @click.stop="">
+      <tr>
+        <td colspan="2">Info about this puzzle</td>
+      </tr>
+      <tr>
+        <td>Image Title: </td>
+        <td>{{game.puzzle.info.imageTitle}}</td>
+      </tr>
+      <tr>
+        <td>Snap Mode: </td>
+        <td>{{scoreMode[0]}}</td>
+      </tr>
+      <tr>
+        <td>Shape Mode: </td>
+        <td>{{shapeMode[0]}}</td>
+      </tr>
+      <tr>
+        <td>Score Mode: </td>
+        <td>{{snapMode[0]}}</td>
+      </tr>
+    </table>
+  </div>
+</template>
+<script lang="ts">
+import { defineComponent, PropType } from 'vue'
+import { Game, ScoreMode, ShapeMode, SnapMode } from '../../common/Types'
+
+export default defineComponent({
+  name: 'help-overlay',
+  emits: {
+    bgclick: null,
+  },
+  props: {
+    game: {
+      type: Object as PropType<Game>,
+      required: true,
+    },
+  },
+  computed: {
+    scoreMode () {
+      switch (this.game.scoreMode) {
+        case ScoreMode.ANY: return ['Any', 'Score when pieces are connected to each other or on final location']
+        case ScoreMode.FINAL:
+        default: return ['Final', 'Score when pieces are put to their final location']
+      }
+    },
+    shapeMode () {
+      switch (this.game.shapeMode) {
+        case ShapeMode.FLAT: return ['Flat', 'all pieces flat on all sides']
+        case ShapeMode.ANY: return ['Any', 'flat pieces can occur anywhere']
+        case ShapeMode.NORMAL:
+        default:
+          return ['Normal', '']
+      }
+    },
+    snapMode () {
+      switch (this.game.snapMode) {
+        case SnapMode.REAL: return ['Real', 'pieces snap only to corners, already snapped pieces and to each other']
+        case SnapMode.NORMAL:
+        default:
+          return ['Normal', 'pieces snap to final destination and to each other']
+      }
+    },
+  },
+})
+</script>