[BIP Proposal] Add BIP-0093 (Codex32) as application to BIP-0085

In an ongoing effort to refine a proposal, significant updates were made based on feedback received. Pseudocode was incorporated to enhance the clarity around character value selection, addressing a specific aspect of the implementation process. Furthermore, adjustments were made to a table by adding an additional column and row, aiming to provide a clearer understanding of the conditions under which the threshold equals zero. This addition is crucial for elucidating the constraint on 'n' when 't' equals zero, ensuring that the documentation accurately reflects the intended functionality.

Additionally, the notes section underwent revisions, particularly in the unshared secret segment. A normative statement was introduced to stipulate that when the threshold is set to "0", 'n' must be precisely one, resulting in the generation of a codex32 secret. This change is pivotal in setting explicit requirements for the output under specific conditions, thereby eliminating ambiguity and enhancing the precision of the documentation.

These modifications have been integrated into the project repository, with the changes being documented in a recent commit. The commit can be accessed directly via this link, facilitating review and further collaboration. These updates reflect an iterative approach to project development, incorporating community feedback to refine and improve the proposal systematically.