tip: Add tip about using calculated properties

src/PowerShellTips/2023-10-14-make-convieninece-to-objects-by-using-calculated-properties.ps1

@@ -0,0 +1,43 @@
+$tip = [tiPS.PowerShellTip]::new()
+$tip.CreatedDate = [DateTime]::Parse('2023-10-14')
+$tip.Title = 'Make convenience to objects by using calculated properties'
+$tip.TipText = @'
+PowerShell is a dynamic language, which means that you can add properties to objects on the fly. By using calculated properties, you can add properties to objects that are calculated from other properties on the object, or data from external sources.
+
+The easiest way to add calculated properties is by using the `Select-Object` cmdlet to return a new object back with the additional properties. You provide a hashtable to the `-Property` parameter, with a `Name` key for the name of the new property and an `Expression` key for the value. You can add as many calculated properties as you want.
+'@
+$tip.Example = @'
+# Get the first process and add a single calculated property to show how long it has been running.
+❯ Get-Process | Select-Object -First 1 -Property ProcessName,StartTime,@{ Name = "RunningTime"; Expression = { (Get-Date) - $_.StartTime } }
+
+ProcessName StartTime              RunningTime
+----------- ---------              -----------
+1Password   10/14/2023 12:59:24 PM 00:32:59.1893342
+
+
+# Add multiple calculated properties (split into multiple lines for readability).
+❯ Get-Process | Select-Object -First 1 -Property ProcessName,`
+    StartTime,@{ Name = "RunningTime"; Expression = { (Get-Date) - $_.StartTime } },`
+    WorkingSet,@{ Name = "WorkingSetMb"; Expression = { $_.WorkingSet / 1MB }}
+
+ProcessName  : 1Password
+StartTime    : 10/14/2023 12:59:24 PM
+RunningTime  : 00:33:03.0717040
+WorkingSet   : 73527296
+WorkingSetMb : 70.12109375
+'@
+$tip.Urls = @(
+	'https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_calculated_properties'
+	'https://4sysops.com/archives/add-a-calculated-property-with-select-object-in-powershell/'
+)
+$tip.Category = [tiPS.TipCategory]::Syntax # Community, Editor, Module, NativeCmdlet, Performance, Security, Syntax, Terminal, or Other.
+
+# Community: Social events and community resources. e.g. PowerShell Summit, podcasts, etc.
+# Editor: Editor tips and extensions. e.g. VSCode, ISE, etc.
+# Module: Modules and module tips. e.g. PSScriptAnalyzer, Pester, etc.
+# NativeCmdlet: Native cmdlet tips. e.g. Get-Process, Get-ChildItem, Get-Content, etc.
+# Performance: Tips to improve runtime performance. e.g. foreach vs ForEach-Object, ForEach-Object -Parallel, etc.
+# Security: Security tips. e.g. ExecutionPolicy, Constrained Language Mode, passwords, etc.
+# Syntax: Syntax tips. e.g. splatting, pipeline, etc.
+# Terminal: Terminal shortcuts and tips. e.g. PSReadLine, Windows Terminal, ConEmu, etc.
+# Other: Tips that don't fit into any of the other categories.