How to create custom powershell cmdlet using Visual Studio 2010

Open Visual Studio 2010.

Go to File => New => Project.

Select Class Library template, enter the name and click Ok.

Add the following references.
 a. System.Management.Automation.dll (C:\Program Files (x86)\Reference
  Assemblies\Microsoft\WindowsPowerShell\v1.0\System.Management.Automation.dll)
 b. System.Configuration.Install.dll
  (C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Configuration.Install.dll
 c. Microsoft.SharePoint.dll (C:\Program Files\Common Files\Microsoft Shared\Web Server
  Extensions\14\ISAPI\Microsoft.SharePoint.dll)
 d. Microsoft.SharePoint.PowerShell.dll   
  (C:\Windows\assembly\GAC_MSIL\Microsoft.SharePoint.PowerShell\14.0.0.0__71e9bce111e
  9429c\Microsoft.SharePoint.Powershell.dll)

Add the following namespaces.
 a. using System.Management.Automation;
 b. using Microsoft.SharePoint;
 c. using Microsoft.SharePoint.PowerShell;

I have renamed Class1.cs file to GetSPWebTitle.cs.

Replace GetSPWebTitle.cs with the following code.

Right click the solution explorer, add a new item.

Select the class template and name it as Installer.cs.

Click on Add.

Replace Installer.cs with the following code.
 

Build the solution.