Add an action to retrieve un simple summary with

the total of jumps and the last jump

Back/skydiveLogs-api/DataContract/SimpleSummaryResp.cs

@@ -0,0 +1,11 @@
+namespace skydiveLogs_api.DataContract
+{
+    public class SimpleSummaryResp
+    {
+        public int TotalJumps { get; set; }
+
+        public int TotalCutaway { get; set; }
+
+        public JumpResp LastJump { get; set; }
+    }
+}