docs(emojiinfo): added documentation

.docs/emojiinfo.md

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+# EmojiInfo
+
+EmojiInfo allows you to nerdify other people's text.
+
+## Installation
+
+```bash
+[p]repo add seacogs https://www.coastalcommits.com/SeaswimmerTheFsh/SeaCogs
+[p]cog install seacogs emojiinfo
+[p]cog load emojiinfo
+```
+
+## Commands
+
+### emoji
+
+- Usage: `[p]emoji <emoji> [ephemeral]`
+
+Retrieve information about the provided emoji. If `ephemeral` is provided and the command is used as a slash command, the response will be sent as an ephemeral message.