Update README.md

Author: heliosrev

README.md

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 # Python Proxy Formatter
 
 A Python script to reformat proxy strings into a consistent format. It can handle various input formats, including HTTP, HTTPS, SOCKS4, SOCKS5, as well as username and password with or without a hostname/IP and port.
+
+## Supported Formats
+
+The Python Proxy Formatter supports the following formats:
+
+    http://hostname:port
+    http://username:password@hostname:port
+    https://hostname:port (converted to http://)
+    https://username:password@hostname:port (converted to http://)
+    socks4://hostname:port
+    socks4://username:password@hostname:port
+    socks5://hostname:port
+    socks5://username:password@hostname:port
+
+## Error Handling
+
+If an invalid proxy format is provided, the reformat_proxy function will raise an exception with an error message.
+
+## Contributions
+
+Contributions to improve and expand the functionality of this Python Proxy Formatter are welcome. Feel free to create issues or pull requests.