Add DocumentCreateReadSQL class for SQL operations

Introduces the `DocumentCreateReadSQL` class in the
`EnvelopeGenerator.Application.SQL` namespace, implementing
the `ISQL<EnvelopeDocument>` interface. This class includes
a `Raw` property for a SQL query to insert and retrieve
documents, along with a static method `CreateParmas`
to generate `DynamicParameters` for SQL queries using
base64 encoded strings and envelope UUIDs.

EnvelopeGenerator.Application/SQL/DocumentCreateReadSQL.cs

@@ -0,0 +1,45 @@
+using Dapper;
+using EnvelopeGenerator.Application.Contracts.SQLExecutor;
+using EnvelopeGenerator.Domain.Entities;
+
+namespace EnvelopeGenerator.Application.SQL;
+
+/// <summary>
+/// 
+/// </summary>
+public class DocumentCreateReadSQL : ISQL<EnvelopeDocument>
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public string Raw => @"
+        USE [DD_ECM]
+
+        DECLARE @BYTE_DATA1 as VARBINARY(MAX)
+        SET @BYTE_DATA1 = CONVERT(VARBINARY(MAX),'@Base64')
+        DECLARE	@OUT_DOCID int
+
+        EXEC	[dbo].[PRSIG_API_ADD_DOC]
+		        @ENV_UID = @OUT_UID,
+		        @BYTE_DATA = @BYTE_DATA1,
+		        @OUT_DOCID = @OUT_DOCID OUTPUT
+
+        SELECT TOP(1) *
+          FROM [dbo].[TBSIG_ENVELOPE_DOCUMENT]
+          WHERE [GUID] = @OUT_DOCID
+    ";
+
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <param name="base64"></param>
+    /// <param name="envelope_uuid"></param>
+    /// <returns></returns>
+    public static DynamicParameters CreateParmas(string base64, string envelope_uuid)
+    {
+        var parameters = new DynamicParameters();
+        parameters.Add("@Base64", base64);
+        parameters.Add("@OUT_UID", envelope_uuid);
+        return parameters;
+    }
+}