Add example script showing how to watch a key, run multiple commands as a transaction and catch any WatchError that occurs.

[simonprickett]

Add an example script that shows how to watch a key and perform multiple commands on it in a transaction, catching any WatchError that occurs if the key changes.

Your example can be based on the code example here: https://github.com/redis/node-redis/blob/master/docs/isolated-execution.md, the best example to implement would be a check and set operation as described here https://redis.io/docs/manual/transactions/#cas

Name your file transaction-with-watch.js. Pay attention to the guidelines for adding an example to ensure that your contribution can be merged.

This is part of our participation in Hacktoberfest 2022. Learn how to complete this issue here: https://redis.io/community/hacktoberfest/

Need help or want to talk to us? Join us on Discord where we have a dedicated Hacktoberfest channel: https://discord.gg/ueQwKUh5Z3

If you're interested in taking this issue on, please mention @simonprickett and @SuzeShardlow in the comments and ask to be assigned.

[rowantrollope]

I would like to work on this. @simonprickett @SuzeShardlow can you assign it to me?

[simonprickett]

@rowantrollope I've assigned this to you, looking forward to seeing your PR in the next couple of days. Have fun and please check out our guidelines:

https://redis.io/community/hacktoberfest/

[SuzeShardlow]

Hi @rowantrollope, how are you doing with this? :)

[simonprickett]

This issue is available to work on.