added ping

cogs/pingCog.py

@@ -0,0 +1,20 @@
+import discord
+from discord.ext import commands
+
+class ExampleCog(commands.Cog):
+
+    def __init__(self, client):
+        self.client = client
+
+    # Events
+    @commands.Cog.listener()
+    async def on_ready(self):
+        print('Bot is online.')
+
+    # Commands
+    @commands.command(aliases=['latency'])
+    async def ping(self, ctx):
+        await ctx.send(f'Pong! `{round(client.latency * 1000)}ms`')
+
+def setup(client):
+    client.add_cog(ExampleCog(client))