Add packages lock to all libraries

[josesimoes]

Details about Problem

Need to add packages lock file to all class library repos.

Description

Use this PR as guideline: nanoframework/nanoFramework.Networking.Sntp#118.

To create the packages.lock.json file:

1. Open a command prompt in the repo root
2. Delete the packages folder
3. enter nuget restore -uselockfile

[Ellerbach]

Maybe you can as well give the steps on how to generate/create the packages lock file?

[networkfusion]

Maybe you can as well give the steps on how to generate/create the packages lock file?

As simple as building the project in visual studio after adding an empty file.

For a better example, check PR's 107, 108 and 109 here: https://github.com/nanoframework/nanoFramework.Aws.IoTCore.Devices/commits/main

[josesimoes]

@Ellerbach done! ✅
@networkfusion nice hack! 🤣