Create readme.md for London meetup

meetup131/readme.md

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+This event was held on 17 September 2024 in London at Techspace Shoreditch
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+https://www.meetup.com/clickhouse-london-user-group/events/302977267/
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+**Agenda**
+- 6:00 PM - 6:40 PM: Arrival and Check-in
+- 6:40 PM - 7:00 PM: An introduction to ClickHouse: Your favourite database, you don't know yet - Christoph Wurm - ClickHouse
+- 7:20 PM - 7:40 PM: Monitoring Payments in Real-Time: How we use Clickhouse to power search and analytics - Josh Thomas, Software Engineer ProcessOut.
+- 7:40 PM - 8:00 PM: Building a Real-Time Financial Analytics Platform with ClickHouse and Kafka - Zach Naimon
+- 8:00 PM - 9:00 PM: Food, Drinks, and Conversation