Update README.md

add contribution section

README.md

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 The `threshold` keyword argument is crucial as it indicates how strict the detector should be. It determines the number of informal Persian indicators, such as informal words and verbs, required to classify a text as informal.
 
 A lower threshold is suitable for smaller text files, while a higher threshold is more appropriate for larger files where some formal sentences might exist but the text should still be marked as informal if it contain a significant number of informal indicators. A threshold of 1 means that a text is considered informal if it contains at least one informal word or verb.
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+## Contribution
+If you come across any issues or have ideas for improvements, please don't hesitate to let us know by opening an issue or sending a pull request. Thank you for using Persian Informal Text Detector!