Added unit tests, added solution, added travis build

CryptoExchange.Net/Interfaces/IExchangeClient.cs

@@ -0,0 +1,11 @@
+using CryptoExchange.Net.RateLimiter;
+
+namespace CryptoExchange.Net.Interfaces
+{
+    public interface IExchangeClient
+    {
+        IRequestFactory RequestFactory { get; set; }
+        void AddRateLimiter(IRateLimiter limiter);
+        void RemoveRateLimiters();
+    }
+}

CryptoExchange.Net/Interfaces/IRequest.cs

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+using System;
+using System.IO;
+using System.Net;
+using System.Threading.Tasks;
+
+namespace CryptoExchange.Net.Interfaces
+{
+    public interface IRequest
+    {
+        Uri Uri { get; }
+        WebHeaderCollection Headers { get; set; }
+        string Method { get; set; }
+
+        void SetProxy(string host, int port);
+
+        string ContentType { get; set; }
+        string Accept { get; set; }
+        long ContentLength { get; set; }
+
+        Task<Stream> GetRequestStream();
+        Task<IResponse> GetResponse();
+    }
+}

CryptoExchange.Net/Interfaces/IRequestFactory.cs

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+namespace CryptoExchange.Net.Interfaces
+{
+    public interface IRequestFactory
+    {
+        IRequest Create(string uri);
+    }
+}

CryptoExchange.Net/Interfaces/IResponse.cs

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+using System.IO;
+
+namespace CryptoExchange.Net.Interfaces
+{
+    public interface IResponse
+    {
+        Stream GetResponseStream();
+    }
+}