docs: Add user guide for emoji

templates/zerver/help/emoji.md

@@ -0,0 +1,27 @@
+# Emoji
+Emoji allow you to add a little character and some fun to your messages! This guide shows you how to send emoji by pasting Unicode, using Zulip’s built-in emoji menu, or typing the emoji code.
+
+### Using the emoji menu
+1. Start by composing a [new message](/help/#posting-and-replying)
+2. Click the smiley face under the left edge of the message box.
+3. Click any emoji to include it in your messsage.
+
+![emoji-menu](/static/images/help/emoji-menu.png)
+
+
+### Unicode
+Zulip fully supports Unicode. To use Unicode in your message:
+
+1. Copy any emoji you would like to include onto your clipboard. For example:😀.
+2. Compose a [new message or reply](/help/#posting-and-replying)
+3. Paste the emoji into the message box.
+
+**Note**: You can browse the [Unicode Consortium's full list of emoji](http://unicode.org/emoji/charts/full-emoji-list.html), however emoji on Zulip may appear different than the ones listed.
+
+### Using emoji codes
+1. Start by composing a [new message or reply](/help/#posting-and-replying)
+2. Type in the emoji code. For example `:smile:` produces the following icon:<img src="/static/third/gemoji/images/emoji/smile.png" alt="smile" style="width: 3%;"/>.
+
+**Note**: If you are unsure of the code for any particular emoji visit [Emoji Cheat Sheet](http://www.webpagefx.com/tools/emoji-cheat-sheet/) for a complete list. Furthermore, after typing `:` and any two letters an autocomplete menu will appear displaying five emoji codes. These emoji contain the letters you typed and are sorted alphabetically by code. You can also cycle through these suggestions by using the `↑` and `↓` arrow keys.
+
+![emoji-code](/static/images/help/emoji-code.png)

templates/zerver/help/index.md

@@ -30,6 +30,7 @@ as a “**realm**”.
 - **[Create a stream](/help/create-a-stream)**
 - **[Posting and replying](#posting-and-replying)**
 - **[Searching](search-messages)**
+- **[Using emoji in messages](/help/emoji)**
 - **[Mention a Team Member](/help/mention-a-team-member)**
 - **[Change Your Name](/help/name-change)**
 - **[Message formatting](/help/message-formatting)**