Add docs

Author: agriyakhetarpal

README.md

@@ -1,12 +1,11 @@
 # Install-PowerShell
 
-A cross‑platform GitHub Action that installs a specific **PowerShell Core** version—or the latest stable release—on any GitHub‑hosted runner
+A cross‑platform GitHub Action that installs a specific **PowerShell Core** version—or the latest stable or preview release—on any GitHub‑hosted runner
 (Linux, macOS, or Windows). The action automatically skips installation when the requested version is already present.
 
 ## Usage
 
 Add the action to a job in your workflow file:
-
 ```yaml
 jobs:
   build:
@@ -25,11 +24,27 @@ jobs:
           Write-Host "Using PowerShell $($PSVersionTable.PSVersion)"
 ```
 
+### Installing preview builds
+
+```yaml
+      - name: Install PowerShell Preview
+        uses: PSModule/install-powershell@v1
+        with:
+          Version: latest
+          Preview: true
+
+      - name: Run a PowerShell script
+        shell: pwsh
+        run: |
+          Write-Host "Using PowerShell $($PSVersionTable.PSVersion)"
+```
+
 ## Inputs
 
 | Input | Required | Default | Description |
 | ----- | -------- | ------- | ----------- |
-| `Version` | `false` | `latest` | Desired PowerShell Core version (e.g. `7.4.1`). Use `latest` to install the newest stable release. |
+| `Version` | `false` | `latest` | Desired PowerShell Core version (e.g. `7.4.1`, `7.6.0-preview.1`). Use `latest` to install the newest stable release, or the newest preview release when `Preview` is `true`. |
+| `Preview` | `false` | `false` | Install PowerShell preview build instead of stable. When `true` and `Version` is `latest`, installs the latest preview release. |
 
 ## Secrets
 
@@ -43,7 +58,7 @@ This action does **not** generate any outputs.
 
 * **Version resolution**
   If `Version` is set to `latest` (case‑insensitive), the action queries the GitHub API for the newest stable release tag in the
-  `PowerShell/PowerShell` repository and substitutes that version.
+  `PowerShell/PowerShell` repository and substitutes that version. When `Preview` is `true`, it queries for the latest preview release instead.
 
 * **Skip logic**
   Before installing, the action checks the current runner to see whether the requested version is already available