Added placeholder.com, css diner, and flexbox defense

benreckas / the-dev-toolkit

The ultimate open-source resource list for people learning web development.

GNU General Public License v3.0

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Closed vchho closed 6 years ago

vchho commented 6 years ago

Added Placeholder.com in dev-tools.md.

Added CSS Diner and Flexbox Defense in learning-resources.md.