Feature - Key phrase search

[dominikcedro]

Implement key phrase search. Focus on searching in single, selected file.

This feature should include:

• Handling txt, py, cpp, md formats.
• Calculating number of occurences of the key phrase.
• Handling scenario, where key phrase is embedded in other words (not only divided by whitespace), for example '12keyphrase12' and 'keyphrase' both should return same output.

Create unit tests (normal and border cases) aswell as E2E tests (simulating input from the user to CLI and looking for correct output).

Branch name jrochatka/feature-keyphrase-search

[jrochatka]

• Find a framework for testing (unitest and E2E)