Add introduction on guild join

src/jarvis.py

@@ -1,8 +1,10 @@
 from discord import Embed, Color, Intents
-from discord.ext import commands, tasks
+from discord.ext import commands
+from discord.utils import find
 from dataclasses import dataclass
 from yaml import load
 from psutil import Process
+from asyncio import sleep
 
 try:
     from yaml import CLoader as Loader
@@ -50,6 +52,22 @@ async def on_ready():
     print("Connected to {} guild(s)".format(len(jarvis.guilds)))
 
 
+@jarvis.event
+async def on_guild_join(guild):
+    general = find(lambda x: x.name == "general", guild.channels)
+    if general and general.permissions_for(guild.me).send_messages:
+        await general.send(
+            "Allow me to introduce myself. I am J.A.R.V.I.S., a virtual "
+            + "artificial intelligence, and I'm here to assist you with a "
+            + "variety of tasks as best I can, "
+            + "24 hours a day, seven days a week."
+        )
+        await sleep(1)
+        await general.send("Importing all preferences from home interface...")
+        await sleep(5)
+        await general.send("Systems are now fully operational")
+
+
 @jarvis.command(name="status", help="Retrieve J.A.R.V.I.S. status")
 async def _status(ctx):
     title = "J.A.R.V.I.S. Status"