Search works (#3)

Still need to clean it up a bit, and make the UI have a collapsed section once the search is completed

src/JobsJobsJobs/Shared/Api/ProfileSearch.cs

@@ -0,0 +1,37 @@
+namespace JobsJobsJobs.Shared.Api
+{
+    /// <summary>
+    /// The various ways profiles can be searched
+    /// </summary>
+    public class ProfileSearch
+    {
+        /// <summary>
+        /// Retrieve citizens from this continent
+        /// </summary>
+        public string? ContinentId { get; set; }
+
+        /// <summary>
+        /// Text for a search within a citizen's skills
+        /// </summary>
+        public string? Skill { get; set; }
+
+        /// <summary>
+        /// Text for a search with a citizen's professional biography and experience fields
+        /// </summary>
+        public string? BioExperience { get; set; }
+
+        /// <summary>
+        /// Whether to retrieve citizens who do or do not want remote work
+        /// </summary>
+        public string RemoteWork { get; set; } = "";
+
+        /// <summary>
+        /// Is the search empty?
+        /// </summary>
+        public bool IsEmptySearch =>
+            string.IsNullOrEmpty(ContinentId)
+            && string.IsNullOrEmpty(Skill)
+            && string.IsNullOrEmpty(BioExperience)
+            && string.IsNullOrEmpty(RemoteWork);
+    }
+}