Add core logic for event handlers. Add gitignore, sample config.

.gitignore

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+config.py
+Temec.session
+__pycache__/

bot.py

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+from telethon import TelegramClient, events
+from matrix_client.client import MatrixClient
+import config
+
+
+async def send_to_matrix(event, room):
+    room.send_text(event.raw_text)
+
+
+matrix_bot = MatrixClient(config.matrix_creds['server'])
+matrix_bot.login(
+    username=config.matrix_creds['username'],
+    password=config.matrix_creds['password']
+)
+client = TelegramClient('Temec', config.api_id, config.api_hash).start()
+rooms = matrix_bot.get_rooms()
+
+for chan_id, room_id in config.mappings:
+    client.add_event_handler(lambda x: send_to_matrix(x, rooms[room_id]),
+                             events.NewMessage(chats=[chan_id]))
+
+
+client.run_until_disconnected()

sample.config.py

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+api_id = 12345
+api_hash = "abcdefghj..."
+
+matrix_creds = {
+    "username": "username",
+    "password": "password",
+    "server": "server"
+}
+
+mappings = [
+    # Each pair is tg channel id, matrix room id
+    (-123456789, '!asdfghjkl'),
+]