loc: add page (#2470)

pages/common/loc.md

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+# loc
+
+> Tool written in Rust that counts lines of code.
+
+- Print lines of code in the current directory:
+
+`loc`
+
+- Print lines of code in the target directory:
+
+`loc {{path/to/directory}}`
+
+- Print lines of code with stats for individual files:
+
+`loc --files`
+
+- Print lines of code without .gitignore (etc.) files (e.g. two -u flags will additionally count hidden files and dirs):
+
+`loc -u`