Add the possibility to create a draft

README.md

@@ -120,6 +120,24 @@ params = {
 message = gmail.send_message(**params)  # equivalent to send_message(to="[email protected]", sender=...)
 ```
 
+### Create a draft:
+
+```python
+from simplegmail import Gmail
+
+gmail = Gmail() # will open a browser window to ask you to log in and authenticate
+
+params = {
+  "to": "[email protected]",
+  "sender": "[email protected]",
+  "subject": "My first email",
+  "msg_html": "<h1>Woah, my first email!</h1><br />This is an HTML email.",
+  "msg_plain": "Hi\nThis is a plain text email.",
+  "signature": True  # use my account signature
+}
+draft = gmail.create_draft(**params)  # equivalent to create_draft(to="[email protected]", sender=...)
+```
+
 It couldn't be easier!
 
 ### Retrieving messages:

simplegmail/draft.py

@@ -0,0 +1,65 @@
+"""
+File: draft.py
+----------------
+This module contains the implementation of the Draft object.
+
+"""
+
+from typing import List, Optional, Union
+
+from httplib2 import Http
+from googleapiclient.errors import HttpError
+
+from simplegmail import label
+from simplegmail.attachment import Attachment
+from simplegmail.label import Label
+from simplegmail.message import Message
+
+
+class Draft(object):
+    """
+    The Draft class for drafts in your Gmail mailbox. This class should not
+    be manually constructed. Contains all information about the associated
+    draft.
+
+    Args:
+        service: the Gmail service object.
+        user_id: the username of the account the draft belongs to.
+        id: the draft id.
+        message: the message.
+
+    Attributes:
+        _service (googleapiclient.discovery.Resource): the Gmail service object.
+        user_id (str): the username of the account the message belongs to.
+        id (str): the draft id.
+        message (Message): the message.
+
+    """
+
+    def __init__(
+        self,
+        service: 'googleapiclient.discovery.Resource',
+        creds: 'oauth2client.client.OAuth2Credentials',
+        user_id: str,
+        id: str,
+        message: Message
+    ) -> None:
+        self._service = service
+        self.creds = creds
+        self.user_id = user_id
+        self.id = id
+        self.message = message
+
+    @property
+    def service(self) -> 'googleapiclient.discovery.Resource':
+        if self.creds.access_token_expired:
+            self.creds.refresh(Http())
+
+        return self._service
+
+    def __repr__(self) -> str:
+        """Represents the object by its sender, recipient, and id."""
+
+        return (
+            f'Draft(to: {self.recipient}, from: {self.sender}, id: {self.id})'
+        )