feat: add Gumroad username validator.

Author: atharva7-g

user_scanner/user_scan/creator/gumroad.py

@@ -0,0 +1,26 @@
+from user_scanner.core.orchestrator import status_validate, Result
+
+def validate_gumroad(user: str) -> Result:
+    if not 3 <= len(user) <= 20:
+        return Result.error("Username must be between 3 and 20 characters.")
+
+    if user != user.lower():
+        return Result.error("Use lowercase letters only.")
+
+    if not user.isascii() or not user.isalnum():
+        return Result.error("Only use lowercase letters and numbers only.")
+
+    url = f"https://{user}.gumroad.com/"
+    return status_validate(url, 404, 200, follow_redirects=True)
+
+
+if __name__ == "__main__":
+    user = input("Username?: ").strip()
+    result = validate_gumroad(user)
+
+    if result == 1:
+        print("Available!")
+    elif result == 0:
+        print("Unavailable!")
+    else:
+        print(f"Error occurred! Reason: {result.get_reason()}")