Minecraft wiki entry for Creating_behavior_packs, associated text: Navigate into your development_behavior_packs folder
(%userprofile%\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\development_behavior_packs\tutorial_behavior_pack)
Select all of the files and folders
Right click on the highlighted files and select send to -> compressed zip folder
Name the file tutorial_behavior_pack.mcpack
Make sure to change the file extension to .mcpack
when the popup asks you if you are sure you want to change the file extension. Hit Yes