Update 'README.md'

README.md

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 # Alphabet-Analyzer
 
-Python-based tool to check if a text uses characters from a given alphabet
+Python-based tool to check if a text uses characters from a given alphabet.
+
+Created for situations where one wants to know if characters from a known alphabet have been used in a text, how many and which.
+
+For example to identify if a japanese text uses Kanji, Katakana or Higakana.