[issue 135] enhanced search

implement enhanced search for chat messages

SharedLibraryCore/Interfaces/IResourceQueryHelper.cs

@@ -0,0 +1,20 @@
+using SharedLibraryCore.Helpers;
+using System.Threading.Tasks;
+
+namespace SharedLibraryCore.Interfaces
+{
+    /// <summary>
+    /// defines the capabilities of a resource queryier
+    /// </summary>
+    /// <typeparam name="QueryType">Type of query</typeparam>
+    /// <typeparam name="ResultType">Type of result</typeparam>
+    public interface IResourceQueryHelper<QueryType, ResultType>
+    {
+        /// <summary>
+        /// queries a resource and returns the result of the query
+        /// </summary>
+        /// <param name="query">query params</param>
+        /// <returns></returns>
+        Task<ResourceQueryHelperResult<ResultType>> QueryResource(QueryType query);
+    }
+}