Add cleanup-step example and README

Authored-by: Jayson Grace <jayson.e.grace@gmail.com>

ttps/examples/steps/cleanup-step/README.md

@@ -0,0 +1,37 @@
+# File Creation and Cleanup using `test-cleanup` Step
+
+Discover how to create and subsequently clean up files leveraging the
+`test-cleanup` step. This example showcases the capability to create a
+directory and remove it in the cleanup step.
+
+---
+
+## Running `cleanup-step.yaml` Demonstration
+
+Execute the following command to illustrate the functionality of
+the `test-cleanup` step:
+
+```bash
+ttpforge run forgearmory//examples/steps/cleanup-step/cleanup-step.yaml
+```
+
+---
+
+## Expected Output
+
+```text
+INFO    [*] Validating Steps
+INFO    [+] Finished validating steps
+INFO    [+] Running current TTP: test-cleanup
+INFO    [+] Running current step: step_one
+INFO    ========= Executing ==========
+# Directory "testDir" is created here
+INFO    ========= Done ==========
+INFO    [+] Finished running step: step_one
+INFO    [*] Completed TTP
+INFO    [*] Starting Cleanup
+INFO    ========= Executing ==========
+# Directory "testDir" is removed here
+INFO    ========= Done ==========
+INFO    [*] Cleanup Complete
+```

ttps/examples/steps/cleanup-step/cleanup-step.yaml

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+---
+name: test-cleanup
+steps:
+  - name: step_one
+    inline: mkdir testDir
+    cleanup:
+      inline: rm -rf testDir