added user/votes request route (#84)

- add route to fetch votes made by current user

src/GregClient/Requests/UserVotes.cs

@@ -0,0 +1,45 @@
+using RestSharp;
+
+namespace Greg.Requests
+{
+    /// <summary>
+    /// Request for getting all votes by the current user.
+    /// </summary>
+    public class GetUserVotes : PackageReferenceRequest
+    {
+        private readonly Method httpMethod = Method.GET;
+
+        /// <summary>
+        /// GET request for fetching all votes by the current user.
+        /// Authentication is required to identify user.
+        /// </summary>
+        public GetUserVotes()
+        {
+            this.ForceAuthentication = true;
+
+            httpMethod = Method.GET;
+        }
+        /// <summary>
+        /// Path used to call remote package manager API endpoint.
+        /// </summary>
+        public override string Path
+        {
+            get { return "user/votes"; }
+        }
+
+        /// <summary>
+        /// Http method used to make remote package manager API call.
+        /// </summary>
+        public override Method HttpMethod
+        {
+            get { return httpMethod; }
+        }
+
+        /// <summary>
+        /// This function can be used to build request for POST/PUT request types which requires some additional headers to be added to the request.
+        /// </summary>
+        internal override void Build(ref RestRequest request)
+        {
+        }
+    }
+}