Add WIP for listing page (#16)

src/JobsJobsJobs/Client/Pages/Listings/Mine.razor

@@ -0,0 +1,25 @@
+@page "/listings/mine"
+@inject HttpClient http
+@inject NavigationManager nav
+@inject AppState state
+
+<PageTitle Title="My Job Listings" />
+<h3>My Job Listings</h3>
+
+<ErrorList Errors=@ErrorMessages>
+  @if (Loading)
+  {
+    <p>Loading job listings&hellip;</p>
+  }
+  else
+  {
+    @if (Listings.Any())
+    {
+      <p>TODO: list them</p>
+    }
+    else
+    {
+      <p><em>No job listings found</em></p>
+    }
+  }
+</ErrorList>

src/JobsJobsJobs/Client/Pages/Listings/Mine.razor.cs

@@ -0,0 +1,41 @@
+using JobsJobsJobs.Shared;
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace JobsJobsJobs.Client.Pages.Listings
+{
+    public partial class Mine : ComponentBase
+    {
+        /// <summary>
+        /// Whether the page is loading data
+        /// </summary>
+        private bool Loading { get; set; } = true;
+
+        /// <summary>
+        /// Error messages encountered while searching for profiles
+        /// </summary>
+        private IList<string> ErrorMessages { get; } = new List<string>();
+
+        /// <summary>
+        /// The job listings entered by the current user
+        /// </summary>
+        private IEnumerable<Listing> Listings { get; set; } = Enumerable.Empty<Listing>();
+
+        protected override async Task OnInitializedAsync()
+        {
+            var listings = await ServerApi.RetrieveMany<Listing>(http, "listing/mine");
+
+            if (listings.IsOk)
+            {
+                Listings = listings.Ok;
+            }
+            else
+            {
+                ErrorMessages.Add(listings.Error);
+            }
+        }
+    }
+}