Fixed Issue241: add try and catch

[yohan-choi-dev]

I realized that there is no content about try and catch

I generated .md and .js files. with followings:

try, catch, finally, and throw explanation with examples.

If you need any other requests, please let me know.

I hope this would be helpful for the project.

[Swap76]

@cyh0968 Very Great work. Easy to understand documentation with very good examples :-)

[Swap76]

@cyh0968 The work you have done for the project is highly appreciated. Thanks :-)

Looking forward to working with you on my new project related to Deno https://github.com/Swap76/Learn-Deno/ and together making this better.

Star to the repo is highly appreciated.