Update README.md

Author: faris0x

README.md

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 # Python-Notepad
 Very simple text editor written in Python!
+
+# Usage
+Go to the releases page and download main.py
+
+Run the file and enter your desired filename and extension
+
+Then type all that you want to write and typpe exit-editor to stop making the file
+
+All you need is Python installed, no dependencies!
+
+# Notes
+When giving the file extension, don't type the '.', it will be added automagically
+
+Thanks for downloading, please star my GitHub!