docs: add comprehensive database configuration instructions to README (#703)

* docs: add comprehensive database configuration instructions to README

Add detailed instructions for custom database configuration using graph drivers:
- Neo4j with custom database name
- FalkorDB with custom database name
- Best practices for using graph drivers
- Environment variable configuration examples

Resolves #702

Co-authored-by: Daniel Chalef <danielchalef@users.noreply.github.com>

* Update README.md

---------

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: Daniel Chalef <danielchalef@users.noreply.github.com>

README.md

@@ -220,15 +220,46 @@ Database names are configured directly in the driver constructors:
 - **Neo4j**: Database name defaults to `neo4j` (hardcoded in Neo4jDriver)
 - **FalkorDB**: Database name defaults to `default_db` (hardcoded in FalkorDriver)
 
-To use a different database name, pass the `database` parameter when creating the driver:
+As of v0.17.0, if you need to customize your database configuration, you can instantiate a database driver and pass it to the Graphiti constructor using the `graph_driver` parameter.
+
+#### Neo4j with Custom Database Name
 
 ```python
+from graphiti_core import Graphiti
 from graphiti_core.driver.neo4j_driver import Neo4jDriver
 
-# Use custom database name
-driver = Neo4jDriver(uri="bolt://localhost:7687", user="neo4j", password="password", database="my_db")
+# Create a Neo4j driver with custom database name
+driver = Neo4jDriver(
+    uri="bolt://localhost:7687",
+    user="neo4j",
+    password="password",
+    database="my_custom_database"  # Custom database name
+)
+
+# Pass the driver to Graphiti
+graphiti = Graphiti(graph_driver=driver)
 ```
 
+#### FalkorDB with Custom Database Name
+
+```python
+from graphiti_core import Graphiti
+from graphiti_core.driver.falkordb_driver import FalkorDriver
+
+# Create a FalkorDB driver with custom database name
+driver = FalkorDriver(
+    host="localhost",
+    port=6379,
+    username="falkor_user",  # Optional
+    password="falkor_password",  # Optional
+    database="my_custom_graph"  # Custom database name
+)
+
+# Pass the driver to Graphiti
+graphiti = Graphiti(graph_driver=driver)
+```
+
+
 ### Performance Configuration
 
 `USE_PARALLEL_RUNTIME` is an optional boolean variable that can be set to true if you wish