[feature] added linear search

[pushpitkamboj]

added linear search algorithm,
fixed #94

[openwisp-companion]

Commit Message and Test Failures

Hello @pushpitkamboj,
(Analysis for commit 314867e)

• Commit Message: The checkcommit tool failed because the commit message is missing a capital letter after the prefix.

• Fix: Ensure your commit message starts with a capital letter after the prefix (e.g., [tag] Capitalized Title #<issue>).

• Test Failure: A ValueError: Something went terribly wrong occurred during testing. The traceback indicates an issue in test.py on line 10.

• Fix: Examine test.py, line 10, and the surrounding code to identify and resolve the ValueError.

[openwisp-companion]

[feature] Added linear search algorithm to the ``pushpit/binary_search.py`` module.

`#95 <https://github.com/openwisp/bot-testing-ground/pull/95>`_