Create nishangInstall.ps1

#Install
To install the module including all source code you can just run in a PowerShell v3 or higher session the following command:
<pre>
iex (New-Object Net.WebClient).DownloadString("https://github.com/samratashok/nishang/nishangInstall.ps1")
</pre>

nishangInstall.ps1

@@ -0,0 +1,25 @@
+# Make sure the module is not loaded
+Remove-Module nishang -ErrorAction SilentlyContinue
+# Download latest version
+$webclient = New-Object System.Net.WebClient
+$url = "https://github.com/samratashok/nishang/master.zip"
+Write-Host "Downloading latest version of Nishang from $url" -ForegroundColor Cyan
+$file = "$($env:TEMP)\Nishang.zip"
+$webclient.DownloadFile($url,$file)
+Write-Host "File saved to $file" -ForegroundColor Green
+# Unblock and Decompress
+Unblock-File -Path $file
+$targetondisk = "$([System.Environment]::GetFolderPath('MyDocuments'))\WindowsPowerShell\Modules"
+New-Item -ItemType Directory -Force -Path $targetondisk | out-null
+$shell_app=new-object -com shell.application
+$zip_file = $shell_app.namespace($file)
+Write-Host "Uncompressing the Zip file to $($targetondisk)" -ForegroundColor Cyan
+$destination = $shell_app.namespace($targetondisk)
+$destination.Copyhere($zip_file.items(), 0x10)
+# Rename and import
+Write-Host "Renaming folder" -ForegroundColor Cyan
+Rename-Item -Path ($targetondisk+"\Nishang-master") -NewName "Nishang" -Force
+Write-Host "Module has been installed" -ForegroundColor Green
+Import-Module -Name Nishang
+Get-Command -Module Nishang
+