docs(cl-camp6): create "checkpoint" version of subject

subjects/devops/cl-camp6/README.md

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+## cl-camp6
+
+### Instructions
+
+"Now, do your inventory"
+
+Create a file `countfiles.sh`, which will print the number **(and only the number)** of regular files and folders contained in the current directory and its sub-folders (the current directory must be included in the count):
+
+### Usage
+
+```console
+$ ./countfiles.sh | cat -e
+12$
+$
+```