az-webapp: add page (#8845)

pages/common/az-webapp.md

@@ -0,0 +1,21 @@
+# az webapp
+
+> Manage Web Applications hosted in Azure Cloud Services.
+> Part of `azure-cli`.
+> Mode information: <https://learn.microsoft.com/cli/azure/webapp>.
+
+- List available runtimes for a web application:
+
+`az webapp list-runtimes --os-type {{windows|linux}}`
+
+- Create a web application:
+
+`az webapp up --name {{name}} --location {{location}} --runtime {{runtime}}`
+
+- List all web applications:
+
+`az webapp list`
+
+- Delete a specific web application:
+
+`az webapp delete --name {{name}} --resource-group {{resource_group}}`