Codetest

- Added
- `None` can be passed as input or output

- Changed
- More Modular tests all the attributes of the tests are optional
- inputs or outputs in the testcase are optional

- Changed
- Updated Documentation
- Fixed
- import issue for packages

- Added
- Dynamic number of variables
- Linked List used in params as list
- Binary Tree used in params as list
- A default test return string which shows test information
- Time Taken to run the function