init readme

README.md

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+# bak-old
+
+## what?
+a script that makes a .bak or .old copy of 
+files and dirs passed as params
+
+## why?
+i was tired of typing `cp /path/to/file /path/to/file.bak`
+when `file` was not in my pwd
+
+## is it complete?
+no