Add Layerbase to the list of free database services

Added Layerbase information about the free serverless databases provided only on the free tier. Did not mention the other 10 engines that require a free trial of a higher tier.

README.md

@@ -1198,6 +1198,7 @@ Update Time, five active automations, webhooks.
   * [CrateDB](https://crate.io/) - Distributed Open Source SQL database for real-time analytics. [Free Tier CRFREE](https://crate.io/lp-crfree): One-node with 2 CPUs, 2 GiB of memory, 8 GiB of storage. One cluster per organization, no payment method needed.
   * [filess.io](https://filess.io) - filess.io is a platform where you can create two databases with up to 10 MB per database of the following DBMS for free: MySQL, MariaDB, MongoDB, and PostgreSQL.
   * [InfluxDB](https://www.influxdata.com/) - Timeseries database, free up to 3MB/5 minutes writes, 30MB/5 minutes reads and 10,000 cardinalities series
+  * [Layerbase](https://layerbase.com/) - 2 free managed databases, pick from: Postgres, MariaDB, Redis, Valkey, DuckDB, SQLite, libSQL, and TypeDB. All with TLS. Branch 7 of 8 free engines, 1 branch per database - 10 GB/day, 50 GB/week, 150 GB/month throughput limits on free. 10 additional engines available on higher tiers with no meters.
   * [MemCachier](https://www.memcachier.com/) - Managed Memcache service. Free for up to 25MB, 1 Proxy Server, and basic analytics
   * [MongoDB Atlas](https://www.mongodb.com/cloud/atlas) - free tier gives 512 MB
   * [Neo4j Aura](https://neo4j.com/cloud/aura/) - Managed native Graph DBMS / analytics platform with a Cypher query language and a REST API. Limits on graph size (200k nodes, 400k relationships).