Moved guides from readme to docs. Refactored docs

docs/creds-guide.md

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+## Creds Guide
+
+This document aims to guide you through the process of creating a Discord account for your bot 
+(the Discord Bot application), and inviting that account into your Discord server.
+
+![Create a bot application and copy token to creds.yml file](https://cdn.nadeko.bot/tutorial/bot-creds-guide.gif)
+
+- Go to [the Discord developer application page][DiscordApp].
+- Log in with your Discord account.
+- Click **New Application**.
+- Fill out the `Name` field however you like.
+- Go to the **Bot** tab on the left sidebar.
+- Click on the `Add a Bot` button and confirm that you do want to add a bot to this app.
+- **Optional:** Add bot's avatar and description.
+- Copy your Token to `creds.yml` as shown above.
+- Scroll down to the `Privileged Gateway Intents` section and enable both intents.
+  These are required for a number of features to function properly, and should both be on.
+
+#### Inviting your bot to your server    
+
+![Invite the bot to your server](https://cdn.nadeko.bot/tutorial/bot-invite-guide.gif)
+
+- On the **General Information** tab, copy your `Application ID` from your [applications page][DiscordApp].
+- Replace the `YOUR_CLIENT_ID_HERE` in this link:
+  `https://discordapp.com/oauth2/authorize?client_id=YOUR_CLIENT_ID_HERE&scope=bot&permissions=66186303` with your `Client ID`
+- The link should now look something like this:
+  `https://discordapp.com/oauth2/authorize?client_id=123123123123&scope=bot&permissions=66186303`
+- Access that newly created link, pick your Discord server, click `Authorize` and confirm with the captcha at the end
+- The bot should now be in your server
+
+That's it! You may now go back to the installation guide you were following before 🎉
+
+[DiscordApp]: https://discordapp.com/developers/applications/me