Update documentation to refelct switch to scylladb/gocql (#333)

README.md

@@ -3,6 +3,19 @@
 GocqlX makes working with Scylla easy and less error-prone.
 It’s inspired by [Sqlx](https://github.com/jmoiron/sqlx), a tool for working with SQL databases, but it goes beyond what Sqlx provides.
 
+## Compatibility
+
+Versions of GocqlX prior to v3.0.0 are compatible with both [Apache Cassandra’s gocql](https://github.com/apache/cassandra-gocql-driver) and [ScyllaDB’s fork](https://github.com/scylladb/gocql).
+However, starting with v3.0.0, GocqlX exclusively supports the scylladb/gocql driver.
+If you are using GocqlX v3.0.0 or newer, you must ensure your `go.mod` includes a replace directive to point to ScyllaDB’s fork:
+
+```go
+# Use the latest version of scylladb/gocql; check for updates at https://github.com/scylladb/gocql/releases
+replace github.com/gocql/gocql => github.com/scylladb/gocql v1.15.1
+```
+
+This is required because GocqlX relies on ScyllaDB-specific extensions and bug fixes introduced in the gocql fork. Attempting to use the standard gocql driver with GocqlX v3.0.0+ may lead to build or runtime issues.
+
 ## Features
 
 * Binding query parameters from struct fields, map, or both