Add testing files for Server scripts.

[Rahul-RB]

As per my knowledge, "Testing" can refer to:

1. Testing the software: check if the Input and Output are as expected. 
2. Testing the hardware: check maximum load, performance on different loads etc.

So, for (1.) we can use libraries like pytest or their wrappers like flask-testing or pytest-flask and define a set of tests. Whereas for (2.) we can use tools like apache-jmeter, locust.io or ab from apache2-utils package.

For now, writing tests for (1.) is the priority.

[Rahul-RB]

Shifted this issue to my forked repository.