fixed bot_base_cog and made an example cog

examples/cog_example.py

@@ -0,0 +1,16 @@
+from discord.ext import commands
+from cogs.base_cog.bot_base_cog import BotBaseCog
+
+class Ping(BotBaseCog):
+
+    def __init__(self, bot):
+        super().__init__(bot)
+        self.setup(__class__.__name__)
+
+    @commands.command()
+    async def ping(self, ctx):
+        await ctx.send("pong")
+        self.logger.info(f"Ping command called by {ctx.author.name}")
+
+async def setup(bot):
+    await bot.add_cog(Ping(bot))