Update README.md

Author: BharathVishal

README.md

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-A text file generator and benchmark app for Android written in Kotlin. Generate upto 50K textfiles (random) in an external storage directory and benchmark the speed.
+A text file generator and benchmark app for Android written in Kotlin. Generate upto 50K text files (random) in an external storage directory and benchmark the speed.
 
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 ### Usage: