<commit_before><commit_msg>misc: Add code explanation in src/README.md<commit_after># Code organisation

The code of the unikernel is separated in different crates/libraries.

- libheap: Crate that contains implementation of different allocators.
- libuni: Main crate that exports all Uni.rs's API.
- libboot: This library is responsible to wrap the user's application and
correctly initialize and setup the environment and the platform. It is not
directly accessible from the user's application.

{'fraction_non_alphanumeric': 0.052313883299798795, 'fraction_numerical': 0.0, 'mean_word_length': 5.148148148148148, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '6762456', 'n_tokens_mistral': 128, 'n_tokens_neox': 122, 'n_words': 63}