Added case-insensitive operators and started unit tests project

SieveUnitTests/Services/SieveCustomFilterMethods.cs

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+using Sieve.Services;
+using SieveUnitTests.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SieveUnitTests.Services
+{
+    public class SieveCustomFilterMethods : ISieveCustomFilterMethods
+    {
+        public IQueryable<Post> IsNew(IQueryable<Post> source, string op, string value)
+        {
+            var result = source.Where(p => p.LikeCount < 100 &&
+                                           p.CommentCount < 5);
+
+            return result;
+        }
+    }
+}

SieveUnitTests/Services/SieveCustomSortMethods.cs

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+using Sieve.Services;
+using SieveUnitTests.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SieveUnitTests.Services
+{
+    public class SieveCustomSortMethods : ISieveCustomSortMethods
+    {
+        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy, bool desc)
+        {
+            var result = useThenBy ?
+                ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount) :
+                source.OrderBy(p => p.LikeCount)
+                .ThenBy(p => p.CommentCount)
+                .ThenBy(p => p.DateCreated);
+
+            return result;
+        }
+    }
+}

SieveUnitTests/Services/SieveOptionsAccessor.cs

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+using Microsoft.Extensions.Options;
+using Sieve.Models;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SieveUnitTests
+{
+    public class SieveOptionsAccessor : IOptions<SieveOptions>
+    {
+        private SieveOptions _value;
+
+        public SieveOptions Value
+        {
+            get
+            {
+                return _value;
+            }
+        }
+
+        public SieveOptionsAccessor()
+        {
+            _value = new SieveOptions();
+        }
+    }
+}