documentation + add unconditionally_encrypt optional kwarg to encrypt()

.gitignore

@@ -1,2 +1,2 @@
 .venv/
-
+.idea/

gpgmymail

@@ -46,12 +46,24 @@ def is_message_encrypted(message: email.message.Message) -> bool:
 
     return message.get_content_type() == "multipart/encrypted"
 
-def encrypt(message: email.message.Message, recipients: typing.List[str]) -> str:
-    """Encrypt given message"""
+def encrypt(
+        message: email.message.Message,
+        recipients: typing.List[str],
+        *,
+        unconditionally_encrypt: bool = False
+    ) -> str:
+    """Encrypt given message
+
+    :param message: an email.message.Message object to be encrypted
+    :param recipients: a List of recipients
+    :param unconditionally_encrypt: if True, will encrypt no matter what. If
+    False (default), will NOT encrypt if any of the following conditions are
+    met:
+    - The message is already encrypted"""
     
     # some mail clients like Thunderbird don't like twice-encrypted emails,
     # so we return the message as-is if it's already encrypted
-    if is_message_encrypted(message):
+    if is_message_encrypted(message) and not unconditionally_encrypt:
         return message.as_string()
     
     encrypted_content = gnupg.GPG().encrypt(message.as_string(), recipients, armor=True)