Add quote list subcommand

bot.py

@@ -261,6 +261,25 @@ async def quote_command(ctx: commands.Context, author: Optional[str], *, quote:
             await ctx.channel.send(quote + '\n        *~' + author + '*')
         else:
             await ctx.channel.send("No quotes present!")
+    elif author == 'list':
+        def create_list_embed(quote_author: str, _quotes: List[str]) -> discord.Embed:
+            embed: discord.Embed = discord.Embed(
+                title=quote_author,
+                description='\n'.join(_quotes)
+            )
+            return embed
+
+        if quote is None:
+            coroutines = []
+            for author, author_quotes in quotes.items():
+                coroutines.append(ctx.send(embed=create_list_embed(author, author_quotes)))
+            await asyncio.gather(*coroutines)
+        else:
+            author = quote.strip().title()
+            if author in quotes:
+                await ctx.send(embed=create_list_embed(author, quotes[author]))
+            else:
+                await ctx.send("No such author!")
     else:
         author = author.strip().title()
         if quote: