Initial work on getting minimal API to work

AS1024.GeoFeed.Core/Interfaces/IGeoFeedCacheProvider.cs

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+using AS1024.GeoFeed.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AS1024.GeoFeed.Core.Interfaces
+{
+    /// <summary>
+    /// Represents a persistent cache GeoFeed provider
+    /// </summary>
+    public interface IGeoFeedPersistentCacheProvider
+    {
+        /// <summary>
+        /// Name of the provider
+        /// </summary>
+        public string ProviderName { get; }
+        /// <summary>
+        /// Returns the GeoFeed
+        /// </summary>
+        /// <returns>String of the CSV geofeed</returns>
+        public string GetGeoFeed();
+        /// <summary>
+        /// Stores the GeoFeed in the cache backend
+        /// </summary>
+        /// <param name="pGeoFeeds">GeoFeed retrieved from the backend</param>
+        /// <returns></returns>
+        public Task<bool> CacheGeoFeed(IList<IPGeoFeed> pGeoFeeds);
+    }
+}