[language/en] Add ada (#4821)

* Add initial Ada docs.

* Change wording.

* Update Empty.

* Remove old comments which have been added to the code.
Have one code block now.

* Update source.

* Add bash to the code block so I get syntax colouring in vscode.

* Add extra on context clauses.

* Update source.

* Add loops.

* Add a warning about the source.

* Update source.

* Add real-time to the description.

* Add info on aspects/contracts.

* Add links to RM.

* Add string/character/array.

* Update source.

* Add new package.

* Add extra info on what's left from Pascal.

* Add fixed/floats.

* Add link to the RM.
Change wording.

* Add distributed with link.

* Fix typo.

* Add a statement on package use.

* Add extra info re the warnings.

* Add more context re Pascal.

* Separate paragraphs.

* More clarification.

* Fix typo.

* Change aspect-oriented to contract-based.

* Add about having to download the gnat toolchain.

* Rejig paragraph.

* Add the extra run commands.

* Add Fer's changes.

* Fix typo.

* Remove extraneous ---, don't know how that got there.

* Fix filename.

* Remove extra comment.

* Remove another empty comment.

* Add back in the generic Swap which was removed for some reason.

* Correction on style.
GNAT definition added.

* Fix definition of starting index of strings.

* Add extra context and examples for String initialisation.

* Remove line to install the toolchain.
Add note about this.

* Add https://learn.adacore.com as a link.

* Add Fabien's contributor link for the extra context added in the previous commits.

* Fix typos.
Add better explanations.

* Add info on limited types.

* Fix typos.

* Add explanation of the generic parameter.

* Add a location of where I referenced OOP.

* Fix text.

* Remove markdown from comments.

* Remove comma.

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