How to start from Scratch? is it necessary to start from the sample app and customize the application?
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@onceelace Please have a look at the Sample App and the documentation that would help you start building your own app. Please let us know if you need any help.
If you want to start from scratch I can highly recommend using the Yeoman generator for Microsoft Teams. See https://aka.ms/yoteams and this simple tutorial https://github.com/OfficeDev/generator-teams/wiki/Build-Your-First-Microsoft-Teams-App
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If you want to start from scratch I can highly recommend using the Yeoman generator for Microsoft Teams. See https://aka.ms/yoteams and this simple tutorial https://github.com/OfficeDev/generator-teams/wiki/Build-Your-First-Microsoft-Teams-App