Add examples

Author: krinart

Cargo.toml

@@ -131,6 +131,16 @@ name = "duckdb"
 path = "examples/duckdb.rs"
 required-features = ["duckdb"]
 
+[[example]]
+name = "duckdb_external_table"
+path = "examples/duckdb_external_table.rs"
+required-features = ["duckdb"]
+
+[[example]]
+name = "duckdb_function"
+path = "examples/duckdb_function.rs"
+required-features = ["duckdb"]
+
 [[example]]
 name = "flight-sql"
 path = "examples/flight-sql.rs"