Added Readme.md and documentation

Readme.md

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+# Ballpit
+
+> Version: 1.0.19362.1
+
+> Created By: Jali <jali@orca-central.de>
+
+> Last Modified By: <jali@orca-central.de>
+
+## Overview
+
+The ```ballpit``` program is a small command line tool written in [Rust](https://www.rust-lang.org). 
+It shows the princible of sorting balls, randomly picked from a ball pit, by their colour. 
+
+The algorithm used here, is implemented in a naïve way, to make it as easy as possible for a layman's audience 
+to understand how it works.
+
+## Usage
+
+The program is run from the command line. It only takes one option ```-n``` or ```--no-of-balls``` which is followed
+by the number of balls to generate inside the pit:
+
+```bash
+./ballpit -n 10000
+```
+
+Runs the program for a pit with 10000 balls.
+
+## The algorithm
+
+The algorithm itself is a very simple and naïve implementation, and it is not a traditional sorting algorithm 
+either. It simply picks a ball from the pit at random, and packs it into one of four buckets, depending on the 
+colour.
+
+![Flussdiagram](./doc/algorithm.png)
+