Add rename.md

common/rename.md

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+# rename
+
+> renames multiple files
+
+- Change foo to bar in matching files
+
+`rename {{'s/foo/bar/'}} {{*.txt}}`
+
+- Convert to lower case
+
+`rename -c {{*.txt}}`
+
+- Replace whitespace with underscores
+
+`rename --nows {{*.txt}}`