Add instructions for API Dash-generated code in csharp(HttpClient)

Author: FreeBono

doc/user_guide/instructions_to_run_generated_code.md

@@ -43,7 +43,84 @@ TODO
 
 ## C# (HttpClient)
 
-TODO
+Here are the detailed instructions for running the generated API Dash code in C# (using `HttpClient`) for macOS, Windows, and Linux:
+
+
+### 1. Setting Up the C# Development Environment
+#### macOS and Windows:
+1. **Install .NET SDK:**
+   - Visit the [official .NET download page](https://dotnet.microsoft.com/download).
+   - Download and install the latest .NET SDK for macOS.
+2. **Verify Installation:**
+   - Open the terminal and run the following command to verify the installation:
+     ```bash
+     dotnet --version
+     ```
+
+
+#### Linux:
+1. **Install .NET SDK:**
+   - Run the following commands based on your distribution:
+     - For Ubuntu/Debian-based systems:
+       ```bash
+       sudo apt update
+       sudo apt install dotnet-sdk-7.0
+       ```
+     - For Fedora/CentOS-based systems:
+       ```bash
+       sudo dnf install dotnet-sdk-7.0
+       ```
+2. **Verify Installation:**
+   - Open the terminal and run the following command to verify the installation:
+     ```bash
+     dotnet --version
+     ```
+
+### 2. Preparing HttpClient
+
+#### In Visual Studio:
+1. **Create a New Project:**
+   - Open Visual Studio and select **Create a new project**.
+   - Choose the **Console Application (.NET Core)** template and create the project.
+
+2. **Check `System.Net.Http` Namespace:**
+   - `HttpClient` is included by default. No additional installation is required.
+
+#### Using the CLI:
+1. **Create a Project:**
+   ```bash
+   dotnet new console -n HttpClientExample
+   cd HttpClientExample
+   ```
+
+2. **Install the Package (if necessary):**
+   ```bash
+   dotnet add package System.Net.Http
+   ```
+
+### 3. Execute the generated code:
+Once you have .NET(C#) and `HttpClient` installed, follow these steps to execute the generated code:
+
+1. **Open a IDE/text editor** ✍️ (Visual Studio, VS Code or any other text editor).
+2. **Copy the generated code** 📋 from API Dash.
+3. **Paste the code** into your project. ex) prgoram.cs
+
+
+### 4. Running the Project
+
+#### In Visual Studio:
+1. Click the **Start Debugging (F5)** button from the top menu to run the project.
+2. The output window will display the API response.
+
+#### Using the CLI:
+1. Open the terminal at the project root directory and run the following command:
+   ```bash
+   dotnet run
+   ```
+
+
+
+
 
 ## C# (RestSharp)