Update README.md

README.md

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-# publish-powershell-module-action
+## Publish PowerShell Module
+
+This GitHub Action enables you to publish a PowerShell module to the [PowerShell Gallery](https://powershellgallery.com).
+
+## Usage
+
+1. Add a GitHub Actions Workflow configuration to your GitHub project, under `.github/workflows/main.yml`
+2. Configure a secret on your GitHub repository, containing your PowerShell Gallery NuGet API key
+3. Add the following step to your GitHub Actions job
+
+For example, if you named your secret `PS_GALLERY_KEY`:
+
+```
+      - name: Publish Module to PowerShell Gallery
+        uses: pcgeek86/publish-powershell-module-action@v19
+        id: publish-module
+        with:
+          modulePath: YOURMODULENAME
+          NuGetApiKey: ${{ secrets.PS_GALLERY_KEY }}
+```