V2.0: Create a Nest seed with basic functionalities

[thatkookooguy]

SEED FOR VERSION 2

FEATURE

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achievibit's build system should be pretty basic.

We need the following things:

• a watch system to restart the server on file changes automatically
• maybe a setup function to start a mongodb instance locally (so developers can just start testing their achievements)
• a function to reset the local mongodb achievibit db to start from scratch easily

Should include:

• Nest for server side inside src/server folder
• Jest unit tests
• All the original achievements from V1

So we can start working on other implementations