Ex 1-1) list datasets whose title contains 'Food'

```
Traceback (most recent call last):
  File "c:\Temp\t.py", line 8, in <module>
    nada.search_by_title('Food')
    ^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'pynada' has no attribute 'search_by_title'
```

https://github.com/klee016/PyNADA/blob/main/examples/Search%20%26%20Browse%20examples.ipynb