[uxntal/en] Add uxntal page

[neauoire]

Community requested here

• I solemnly swear that this is all original content of which I am the original author
• Pull request title is prepended with [language/lang-code] (example [python/fr-fr] or [java/en])
• Pull request touches only one file (or a set of logically related files with similar changes made)
• Content changes are aimed at intermediate to experienced programmers (this is a poor format for explaining fundamental programming concepts)
• If you've changed any part of the YAML Frontmatter, make sure it is formatted according to CONTRIBUTING.md
  • Yes, I have double-checked quotes and field names!

[Menelion]

Thank you! There are some really small typos, you can commit the suggestions or I can do it myself and then merge.

[neauoire]

Thank you for taking to time to fix the typos, second-language English 🤚

[neauoire]

@Menelion For the language to show up on the index, should I have done anything special?

[Menelion]

@neauoire I guess, no :)

[Ismael-VC]

@Menelion do you know why the index is not being updated with this new entry? Regards.

[Menelion]

Absolutely no idea, sorry. @adambard Any thoughts?

[Ismael-VC]

@Menelion No idea, but it is online now, thank you very much!