Create commands/workspace/show.html.md (#18355)

Add documentation for `terraform workspace show` command

website/docs/commands/workspace/show.html.md

@@ -0,0 +1,24 @@
+---
+layout: "commands-workspace"
+page_title: "Command: workspace show"
+sidebar_current: "docs-workspace-sub-show"
+description: |-
+  The terraform workspace show command is used to output the current workspace.
+---
+
+# Command: workspace show
+
+The `terraform workspace show` command is used to output the current workspace.
+
+## Usage
+
+Usage: `terraform workspace show`
+
+The command will display the current workspace.
+
+## Example
+
+```
+$ terraform workspace show
+development
+```