chgrp: add page

pages/common/chgrp.md

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+# chgrp
+
+> Change group ownership of files and folders.
+
+- Change the owner of a file/folder:
+
+`chgrp {{group}} {{path/to/file}}`
+
+- Recursively change the owner of a folder and its contents:
+
+`chgrp -R {{group}} {{path/to/folder}}`
+
+- Change the owner of a symbolic link:
+
+`chgrp -h {{user}} {{path/to/symlink}}`
+
+- Change the owner of a file/folder to match a reference file:
+
+`chgrp --reference={{path/to/reference_file}} {{path/to/file}}