Add README

README.md

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+# Minecraft Username to UUID
+Convert old Minecraft usernames to their UUID.
+
+# Dependencies
+None :)
+
+# Usage
+1. Add the username_to_uuid.py file to your Python path.
+2. Use the library like this:
+```
+from username_to_uuid import UsernameToUUID
+
+converter = UsernameToUUID("MrLolEthan")
+uuid = converter.get_uuid()
+
+... # Do stuff
+```
+The contents of `uuid` will now be:
+`854dd5e0fe044568a787053417ea6335`
+