improve windows docs

windows/environment-variables.md

@@ -1,5 +1,5 @@
-# Variables in Windows
-## How to use in PowerShell
+# Environment Variables in Windows
+## How to use them in PowerShell
 Environment Varaibles can be used in PowerShell ([[powershell]]) with the prefix `$env:`.
 
 **Example***:

windows/powershell.md

@@ -0,0 +1,42 @@
+# PowerShell Cheat-Sheet
+PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.
+
+## Install PowerShell
+PowerShell was made open-source and cross-platform with PowerShell Core, and can be installed on multiple operating systems.
+
+### Windows
+1. Download MSI Package from the [Official PowerShell Docs](https://docs.microsoft.com/en-us/powershell/scripting/install/installing-powershell-on-windows?view=powershell-7.2)
+2. Set up PowerShell Profile in Windows Terminal ([[windowsterminal]]).
+```json
+"commandline": "pwsh.exe -nologo",
+"name": "Powershell",
+"source": "Windows.Terminal.PowershellCore"
+```
+
+### Linux (Ubuntu)
+```sh
+# Update the list of packages
+sudo apt-get update
+# Install pre-requisite packages.
+sudo apt-get install -y wget apt-transport-https software-properties-common
+# Download the Microsoft repository GPG keys
+wget -q https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb
+# Register the Microsoft repository GPG keys
+sudo dpkg -i packages-microsoft-prod.deb
+# Update the list of packages after we added packages.microsoft.com
+sudo apt-get update
+# Install PowerShell
+sudo apt-get install -y powershell
+# Start PowerShell
+pwsh
+```
+
+## Profile
+Set up a PowerShell Profile by opening the profile script :
+```powershell
+code $PROFILE
+```
+
+## (Optional) Set up starship Prompt
+You can customize the look and feel of PowerShell with the Starship Prompt ([[starship]]).
+