Update examples

examples/welcomebot.py

@@ -0,0 +1,29 @@
+"""This is the Welcome Bot in @PyrogramChat.
+
+It uses the Emoji module to easily add emojis in your text messages and Filters
+to make it only work for specific messages in a specific chat.
+"""
+
+from pyrogram import Client, Emoji, Filters
+
+TARGET = "PyrogramChat"  # Target chat. Can also be a list of multiple chat ids/usernames
+MENTION = "[{}](tg://user?id={})"  # User mention markup
+MESSAGE = "{} Welcome to [Pyrogram](https://docs.pyrogram.ml/)'s group chat {}!"  # Welcome message
+
+app = Client("my_account")
+
+
+# Filter in only new_chat_members updates generated in TARGET chat
+@app.on_message(Filters.chat(TARGET) & Filters.new_chat_members)
+def welcome(client, message):
+    # Build the new members list (with mentions) by using their first_name
+    new_members = [MENTION.format(i.first_name, i.id) for i in message.new_chat_members]
+
+    # Build the welcome message by using an emoji and the list we built above
+    text = MESSAGE.format(Emoji.SPARKLES, ", ".join(new_members))
+
+    # Send the welcome message, without the web page preview
+    message.reply(text, disable_web_page_preview=True)
+
+
+app.run()  # Automatically start() and idle()