UPdated README.md

README.md

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 # tszero
-Filter for tar and zip archives that sets all timestamps to zero. This allows archives with content that is the same except for timestamps to compare as equal.
+Filter for tar and zip archives that sets all timestamps to zero. For zip files,
+it also removes extra data from file headers. This allows filtered versions of
+archives with content that is the same except for timestamps to compare as 
+equal and to have the same hash.
+
+To use tszero on a tar file, the command syntax is
+```shell
+tszero -format tar fileName
+```
+
+For a zip file, the command syntax is
+```shell
+tszero -format zip fileName
+```
+
+The filtered archive file is written to stdout.
+
+No binary distribution of tszero is currently available.
+
+You can install tszero from source. To do this you must first have go 
+installed. If it is not already installed you can download it from 
+https://golang.org/dl/
+
+Once go is installed, check out this repository and issue the command 
+```shell
+go install
+```