Resolve "Allow the user to read description of the shot"

Closes #41 (closed)

Intention

Allow the user of pyCDB to read record description and record type.

Solution

1. This update adds a function get_record() which supplied details about the record.

2. This update corrects last_record_number() which returned -1 even though there was the first record (record 0) in the database. This blocked add_record() on an empty database in tests.

3. This update enables VSCode to provide list of arguments. It looks like the use of decorator() resulted into reporting the function as () -> ((...) -> Any).

Test

• This update was tested through automated tests.