Update and rename getting_started.md to getting_started-public.md

Author: TimGoTheCreator

docs/getting_started-public.md

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+# What is NEXT exactly?
+
+NEXT is an N-Body gravity code for astrophysics and such. 
+
+## What does that mean?
+
+Its a Computer program made in the low-level programming language C++ designed for running on workstations
+or supercomputers that simulates forces between objects called **"Newtonian Gravity"**
+
+## What does N-Body mean?
+
+The term "N-Body" simply means **"multiple"** or **"many"** bodies, N could stand for 1, 500, or even millions!
+**"Body"** refers to such object in the simulation, it could be a star, a planet, or just particles.
+
+**So, an "N-Body" simulation is just a way of calculating how "N" objects move under gravity when they all pull in at eachother in the same time.**