Add Webhook Documentation

Added documentation for Webhook Support in README.md.

Author: Peashooter101

README.md

@@ -50,4 +50,44 @@ You can use placeholderAPI placeholders in the messages in the config by doing:
 
 > Note: This only works in the `config.yml`
 >
-> This will not work for messages in the `locale.yml`
+> This will not work for messages in the `locale.yml`
+
+### Webhook Support
+
+Using v2.5.0 or higher, you can use Webhooks as a way to log messages sent via SimplePMs. Previously you may have used DiscordSRV to log SimplePM messages to Discord.
+
+By default the `config.yml` offers these options:
+
+```yml
+###
+# This adds Webhook Support focused for Discord
+###
+webhook:
+  enabled: false
+  url: ""
+  # This is the JSON Body to send to the webhook.
+  # The default value is modeled after https://docs.discord.com/developers/resources/webhook#execute-webhook
+  # These are the placeholders that can be used:
+  #   <sender>: Sender's Username
+  #   <sender_display_name>: Sender's Display Name (Nickname), Non-players will have the same name as <sender>
+  #   <sender_uuid>: Sender's UUID, formatted as xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, this is blank for non-players.
+  #   <recipient>: Recipient's Username
+  #   <recipient_display_name>: Recipient's Display Name (Nickname), Non-players will have the same name as <recipient>
+  #   <recipient_uuid>: Recipient's UUID, formatted as xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, this is blank for non-players.
+  #   <message>: The message sent through SimplePMs.
+  #   <timestamp>: Unix Timestamp (https://www.unixtimestamp.com/)
+  json-body: |
+    {
+      "content": "{message}\n-# {sender_display_name} ({sender}) sent {recipient_display_name} ({recipient}) this on <t:{timestamp}>",
+      "avatar_url": "https://mc-heads.net/avatar/{sender_uuid}",
+      "username": "{sender} > {recipient}"
+    }
+```
+
+- **Enabled**: Whether or not webhooks are enabled.
+- **URL**: URL of the webhook.
+- **JSON Body**: JSON formatted string intended to be sent as the body in a POST request. Placeholders exist for use as well.
+
+If you are using this for Discord,
+- The documentation for the JSON body can be found here: https://docs.discord.com/developers/resources/webhook#create-webhook
+- Creating a webhook for Discord can be found here: https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks