Convert TXT COMMONMARK to OPML

The TXT file extension is associated with CommonMark Markdown Language, a simplified markup language designed for easy readability and writability. Markdown is widely used in documentation, blogging, and formatting readme files in software development. Introduced in 2014, CommonMark aims to standardize Markdown's diverse implementations. Its clarity and simplicity make it a preferred choice for developers and technical writers seeking to maintain clean, structured documents.

OPML, or Outline Processor Markup Language, is a file format utilized primarily for outlining data structures. Initially developed in 2000 by UserLand Software, OPML was designed to facilitate the exchange of outline-based information between different software applications. Its uses have expanded over time, notably in organizing RSS feed lists and managing hierarchical data. The OPML file extension denotes XML-based documents that offer simplicity and interoperability in transferring structured information across diverse platforms. In essence, OPML serves as a versatile tool in the realm of data organization and syndication.