Resolve "Add Automated Secrets Detection"

Closes #6 (closed)

examples/Detect-Secrets.md

+# Secrets detection example
+## Detects secrets in the current project
+
+- One 'analysis' stage with one job
+  
+``` yml
+stages:
+  - analysis 
+variables:
+  stage: analysis
+  tags:
+    - docker
+  script:
+    - docker run --rm -v "${PWD}:/work" -w /work its-registry.unl.edu/unl-its/docker-ci/detect-secrets -s
+```