Added tutorial on how to create an embed

Had some spare time and figured I'd help out by creating a tutorial. Tried to follow the format in the rest of the bot tutorial, but if there are things that needs changing, please let me know!

docs/bot_tutorial/message_embeds.md

@@ -0,0 +1,62 @@
+# Message Embeds
+
+A [Message Embed](https://b1naryth1ef.github.io/disco/api/disco_types_message.html#messageembed) represents a Discord Embed object. An Embed object is used to display certain data, in a more layed out and prety way than regular Discord messages.
+
+An example of a message embed: 
+
+![alt text](https://i.stack.imgur.com/HRWHk.png "A discord embed")
+
+An embed can contain the following buildstones:
+* Author, including link and avatar
+* Title
+* Description
+* Field(s)
+* Thumbnail image
+* Image
+* Footer text
+* Footer icon
+* Timestamp
+Next to these, you can set the embeds color, which will set the color of the left sidebar of the embed.
+
+## Creating an embed
+Creating an embed is simple, and can be done like this:
+```py
+from disco.types.message import MessageEmbed
+from datetime import datetime
+
+embed = MessageEmbed()
+```
+This will create a default, empty, Discord Embed object. Now that we have that, let's assign some values to it. First, lets set the author and the title, with a link that leads to this page. This can be done as follows:
+```py
+embed.set_author(name='b1nzy#1337', url='https://b1naryth1ef.github.com/disco', icon_url='http://i.imgur.com/1tjdUId.jpg')
+embed.title = 'How to create an embed'
+embed.url = 'https://b1naryth1ef.github.io/disco/bot_tutorial/message_embeds.html' #This URL will be hooked up to the title of the embed
+```
+Now, we can add a description and a few fields:
+```py
+embed.add_field(name='Inline field 1', value='Some value for this field', inline=True)
+embed.add_field(name='Inline field 2', value='Another value for another field', inline=True)
+embed.add_field(name='Inline field 3', value='Third value for the third field', inline=True)
+embed.add_field(name='A non-inline field', value='You can only have a max of 3 inline field on 1 line', inline=False)
+embed.description = 'This is the general description of the embed, you can use the Discord supported MD in here too, to make it look extra fancy. For example, creating some **bold** or ~~striketrhough~~ text.'
+```
+Last up, let's set a footer, color and add a timestamp
+```py
+embed.timestamp = datetime.utcnow().isoformat()
+embed.set_footer(text='Disco Message Embeds tutorial')
+embed.color = '10038562' #This can be any color, but I chose a nice dark red tint
+```
+
+Once your embed is finshed, you can send it using the `channels_messages_create()` message or the `event.msg.reply()` function in a command like this:
+with `channels_messages_create()`:
+```py
+self.bot.client.api.channels_messages_create(<ChannelID>, '<optional text>', embed=embed)
+```
+with the `event.msg.reply()` function:
+```py
+event.msg.reply('<optional text>', embed=embed)
+```
+
+The final embed we created in this tutorial would look like this:
+
+![alt text](http://i.imgur.com/G1sUcTm.png "The final embed")