[Examples/Docs] Tic-tac-toe (#18558)

## Description 

A README for the tic-tac-toe app example, derived from:

https://github.com/MystenLabs/multisig_tic-tac-toe/blob/main/README.md

And updates to the docs for the tic-tac-toe app example to reflect
changes to
modernise the guide and bring all its source code into the `sui`
mono-repo.

This is the last major example that lived in the `sui_programmability`
directory.

## Test plan 

:eyes:

## Stack

- #18525 
- #18526 
- #18557 

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## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
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- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

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Co-authored-by: Ronny Roland <[email protected]>