add notes about outdated docs

Author: vgvoleg

examples/basic_example_v1/README.md

@@ -1,5 +1,7 @@
 # YDB Python SDK Example: basic_example_v1
 
+**This example is outdated, please see [example with new API](../basic_example_v2/)**
+
 Example code demonstrating the basic YDB Python SDK operations.
 
 See the top-level [README.md](../README.md) file for instructions on running this example.