Added Readme

README.md

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+# 5sim.net Api Library
+This is a library to use the official 5sim Api.
+## Installation
+Import the .dll into your project.
+
+## Usage
+Create a new `_5sim.Api`.
+Within the constructor-method you pass your api-token from 5sim.
+
+## How to use it
+I am mostly following the official Api from 5sim,
+therefore you should have a look at their Api: https://5sim.net/docs/api_en.txt?68dc38df57 (24.02.2020)