Feature/cryptoclients update (#198)

CryptoExchange.Net/Interfaces/IBaseApiClient.cs

@@ -12,6 +12,14 @@ namespace CryptoExchange.Net.Interfaces
         /// </summary>
         string BaseAddress { get; }
 
+        /// <summary>
+        /// Format a base and quote asset to an exchange accepted symbol 
+        /// </summary>
+        /// <param name="baseAsset">The base asset</param>
+        /// <param name="quoteAsset">The quote asset</param>
+        /// <returns></returns>
+        string FormatSymbol(string baseAsset, string quoteAsset);
+
         /// <summary>
         /// Set the API credentials for this API client
         /// </summary>

CryptoExchange.Net/Interfaces/IOrderBookFactory.cs

@@ -0,0 +1,27 @@
+using CryptoExchange.Net.Objects.Options;
+using System;
+
+namespace CryptoExchange.Net.Interfaces
+{
+    /// <summary>
+    /// Factory for ISymbolOrderBook instances
+    /// </summary>
+    public interface IOrderBookFactory<TOptions> where TOptions : OrderBookOptions
+    {
+        /// <summary>
+        /// Create a new order book by symbol name
+        /// </summary>
+        /// <param name="symbol">Symbol name</param>
+        /// <param name="options">Options for the order book</param>
+        /// <returns></returns>
+        public ISymbolOrderBook Create(string symbol, Action<TOptions>? options = null);
+        /// <summary>
+        /// Create a new order book by base and quote asset names
+        /// </summary>
+        /// <param name="baseAsset">Base asset name</param>
+        /// <param name="quoteAsset">Quote asset name</param>
+        /// <param name="options">Options for the order book</param>
+        /// <returns></returns>
+        public ISymbolOrderBook Create(string baseAsset, string quoteAsset, Action<TOptions>? options = null);
+    }
+}