Added discord bot example (#6)

examples/discord_bot.py

@@ -0,0 +1,47 @@
+from io import BytesIO
+
+import discord
+from PIL import Image
+from discord.ext import commands
+from quickchart import QuickChart
+
+description = '''An example bot to showcase the use of QuickChart with discord.py module.'''
+
+intents = discord.Intents.default()
+
+bot = commands.Bot(command_prefix='!', description=description, intents=intents)
+
+
+@bot.event
+async def on_ready():
+    print(f'Logged in as {bot.user.name}')
+
+
+@bot.command()
+async def graph(ctx):
+    qc = QuickChart()
+    qc.width = 600
+    qc.height = 300
+    qc.device_pixel_ratio = 2.0
+    qc.config = {
+        "type": "bar",
+        "data": {
+            "labels": ["Hello world", "Test"],
+            "datasets": [{
+                "label": "Foo",
+                "data": [1, 2]
+            }]
+        }
+    }
+    with Image.open(BytesIO(qc.get_bytes())) as chat_sample:
+        output_buffer = BytesIO()  # By using BytesIO we don't have to save the file in our system.
+        chat_sample.save(output_buffer, "png")
+        output_buffer.seek(0)
+    await ctx.send(file=discord.File(fp=output_buffer, filename="chat_sample.png"))  # Change the file name accordingly.
+
+
+@graph.before_invoke
+async def before_test_invoke(ctx):
+    await ctx.trigger_typing()  # Take time to render and send graph so triggering typing to reflect bot action.
+
+bot.run('token')