docs(cl-camp3): create "checkpoint" version of subject

subjects/devops/cl-camp3/README.md

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+## cl-camp3
+
+### Instructions
+
+"start looking ..."
+
+Create a file `look`, which will look for and show, in the current directory and its sub-folders:
+
+- everything that starts with an `a` or,
+- all the files ending with a `z` or,
+- all files starting with `z` and ending with `a!`.