- 增加 EfCoreFluentApi 扩展包，接近 efcore fluentApi 的使用习惯；#4

- 增加 ColumnAttribute 属性 InsertValueSql，插入数据的时候指定用 sql 值；

Extensions/FreeSql.Extensions.EfCoreFluentApi/ICodeFirstExtensions.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+using FreeSql.DataAnnotations;
+
+namespace FreeSql.Extensions.EfCoreFluentApi
+{
+    public static class ICodeFirstExtensions
+    {
+
+        static void Test()
+        {
+            ICodeFirst cf = null;
+            cf.Entity<TestInfo>(eb =>
+            {
+                eb.Property(b => b.Name).HashColumnType("varchar(50)");
+                eb.Property(b => b.FullName).HashColumnType("varchar(60)");
+
+                eb.HasKey(a => a.Id).HasKey(a => new { a.Id, a.Name });
+                eb.HasIndex(a => a.Name).IsUnique().HasName("idx_xxx11");
+            });
+        }
+        class TestInfo
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+            public string FullName { get; set; }
+            public int DefaultValue { get; set; }
+        }
+
+        public static ICodeFirst Entity<T>(this ICodeFirst codeFirst, Action<EfCoreTableFluent<T>> modelBuilder)
+        {
+            codeFirst.ConfigEntity<T>(tf => modelBuilder(new EfCoreTableFluent<T>(tf)));
+            return codeFirst;
+        }
+    }
+}