adds simple cookie to store active player_id

lootalot_front/src/App.vue

@@ -30,6 +30,8 @@ export const store = {
     setActivePlayer (newPlayerId) {
         if (this.debug) console.log('setActivePlayer to ', newPlayerId)
         this.state.player_id = newPlayerId
+        document.cookie = `player_id=${newPlayerId};`;
+        if (this.debug) console.log('setCookie', document.cookie);
     },
     switchPlayerChestVisibility () {
         if (this.debug) console.log('switchPlayerChestVisibility', !this.state.show_player_chest)
@@ -37,11 +39,37 @@ export const store = {
     }
 }
 
+function getCookie(cname) {
+  var name = cname + "=";
+  var decodedCookie = decodeURIComponent(document.cookie);
+  var ca = decodedCookie.split(';');
+  for(var i = 0; i <ca.length; i++) {
+    var c = ca[i];
+    while (c.charAt(0) == ' ') {
+      c = c.substring(1);
+    }
+    if (c.indexOf(name) == 0) {
+      return c.substring(name.length, c.length);
+    }
+  }
+  return "";
+}
+
 export default {
   name: 'app',
   components: {
     Player,
     GroupChest
+  },
+  created () {
+    const cookie = getCookie("player_id");
+    if (cookie == "") {
+        return;
+    } else {
+        var newPlayerId = Number(cookie);
+        console.log("initiated with id", newPlayerId); 
+        store.setActivePlayer(newPlayerId);
+    }
   }
 }
 </script>