Added two more practical talks/presentations

[sumanp]

I want to contribute to this list and help the maintainers, so:

• [x] I've accepted the terms of the CC0 License;
• [x] I've added the topic rubyml to the contributed repository if appropriate.

[arbox]

Hi @sumanp ,

thank you for these suggestions!

I'd ask you to do the following changes to your PR:

• add one thing per commit;
• add the Github mention of the author name to the commit message if possible;
• add new stuff to the bottom of the appropriate categories.

Thank you again and try to refine your PR :+1:

[sumanp]

Hi @arbox,

Thank you for the tip & the encouragement. I'll certainly follow the guidelines for the PR.

Thanks 👍

[arbox]

Apropos, you don't have to close the PR, you can just push to the same branch again, the PR will be automatically updated :smiley:

[sumanp]

Aah! that's so convenient. My first contribution you see. Thank you for all the suggestion 😄

[arbox]

You're welcome!

[arbox]

Thank you! Added :smiley: