I lost my project file as if it had been deleted how to i get it back?

Development Modding
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2

Create new project and move everything to new project forder, if assets won’t be visible import them. If you have C++ modules you will need to add them manually to uproject file, put this below "Description": "",, i think what you should enter here is self explonatory :

"Modules": [
	{
		"Name": "ModuleName",
		"Type": "Runtime",
		"LoadingPhase": "Default"
	}
]

You also create C++ project with same name, by defult UE4 creates 1 C++ runtime module with same name as project name