Add cloc

Find out more about cloc here: https://github.com/AlDanial/cloc

pages/common/cloc.md

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+# cloc
+
+> Count, and compute differences of, lines of source code and comments.
+
+- Count all the lines of code in a directory:
+
+`cloc {{/path/to/base/directory}}`
+
+- Count all the lines of code in a directory, displaying a progress bar during the counting process:
+
+`cloc --progress 1 {{/path/to/base/directory}}`
+
+- Compare 2 directory sturctures and count the differences between them:
+
+`cloc --diff {{/path/to/dir/one}} {{/path/to/dir/two}}`