Add project files.

OemanTrader.FinantialModelingPrepAPI/Services/StockPriceService.cs

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+using OemanTrader.Domain.Exceptions;
+using OemanTrader.Domain.Services;
+using OemanTrader.FinantialModelingPrepAPI.Results;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.FinantialModelingPrepAPI.Services
+{
+    public class StockPriceService : IStockPriceService
+    {
+        private readonly FinancialModelingPrepHttpClientFactory _httpClientFactory;
+
+        public StockPriceService(FinancialModelingPrepHttpClientFactory httpClientFactory)
+        {
+            _httpClientFactory = httpClientFactory;
+        }
+        public async Task<double> GetPrice(string symbol)
+        {
+            using (FinancialModelingPrepHttpClient client = _httpClientFactory.CreateHttpClient())
+            {
+                string uri = "stock/real-time-price/" + symbol;
+
+                //HttpResponseMessage response = await client.GetAsync(uri + "?apikey=2035d4934632e1d7c38f15982e39d3aa");
+                StockPriceResult stockPriceResult = await client.GetAsync<StockPriceResult>(uri);
+
+                if (stockPriceResult.Price == 0)
+                {
+                    throw new InvalidSymbolException(symbol);
+                }
+
+                return stockPriceResult.Price;
+            }
+        }
+    }
+}