Readme.md is added

Author: kizisoft

ReadMe.md

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+# Infragistics.QueryBuilder.Executor
+
+A .NET 9 library for dynamic, strongly-typed query building and execution over Entity Framework Core data sources. Supports advanced filtering, projection, and SQL generation.
+
+[![NuGet](https://img.shields.io/nuget/v/Infragistics.QueryBuilder.Executor.svg)](https://www.nuget.org/packages/Infragistics.QueryBuilder.Executor/)
+
+---
+
+## Installation
+
+Install via NuGet Package Manager:
+
+`dotnet add package Infragistics.QueryBuilder.Executor`
+
+
+---
+
+## Features
+
+- **Dynamic Query Execution**: Compose and execute queries at runtime using a flexible object model.
+- **Advanced Filtering**: Nested filters, logical operators (AND/OR), and rich condition support.
+- **Projection**: Select specific fields or project to DTOs.
+- **SQL Generation**: Generate SQL from the query model for diagnostics or analysis.
+- **ASP.NET Core Integration**: Easily expose query endpoints.
+
+---
+
+## Getting Started
+
+### 1. Register the QueryBuilder Service
+
+In your `Startup.cs` or Program configuration:
+
+`services.AddQueryBuilder<MyDbContext, MyResultDto>();`
+
+
+### 2. Expose a Query Endpoint
+
+`app.UseEndpoints(endpoints => { endpoints.UseQueryBuilder<MyDbContext, MyResultDto>("/api/query"); });`
+
+
+### 3. Example Query Payload
+
+`{ "Entity": "Users", "ReturnFields": ["Id", "Name"], "Operator": "And", "FilteringOperands": [ { "FieldName": "IsActive", "Condition": { "Name": "equals" }, "SearchVal": true } ] }`
+
+
+### 4. Generate SQL (Optional)
+
+`var sql = SqlGenerator.GenerateSql(query);`
+
+
+---
+
+## Query Model
+
+- **Query**: Describes the entity, fields, logical operator, and filters.
+- **QueryFilter**: Represents a filter or group of filters.
+- **QueryFilterCondition**: Specifies the comparison type (e.g., equals, contains).
+
+---
+
+## Dependencies
+
+- .NET 9
+- Microsoft.EntityFrameworkCore
+- AutoMapper
+
+---
+
+## License
+
+This package is provided as-is for public and demonstration use.
+
+---
+
+*For more details, see the source code or contact the maintainers.*