Easiest way to add user’s workplace to a custom map?

Does anyone know a way to allow a website’s users to enter from the frontpage their workplace (e.g. a hospital) directly into a custom Google maps?
Basically to build over time a custom Goggle maps that displays the various location pins entered by the users and that can grow over time?
I imagine it as a frontpage with a search bar for Google maps which then displays the list of matches and once you select one you get the option to confirm it and add it to the custom map.
Another user would then be able to add another pin, etc. all while growing the list of custom places on the map.
Any suggestions where to start would be much appreciated!

 

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