Added readme

readme.md

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+# Aut-Cream-API
+
+Set your game automatically up for use with CreamAPI.
+
+## Installation
+
+**Make sure you have Java 8 installed.**  
+Download the latest release and extract it into any folder (e.g. `%USERPROFILE%\Desktop\auto-cream-api`).
+
+## Usage
+
+* Double-click `auto-cream-api.jar` to open the application. (When starting it for the first time, it might take a few 
+seconds since it needs to cache a list of games available on the Steam Store.)
+  * Alternatively, open a CMD window in the location of the application, and run it by entering the following:
+    ```shell script
+    java -jar auto-cream-api.jar
+    ```
+* Click on the *Folder* (📂) button on the top right and select the *steam_api.dll* or *steam_api64.dll* 
+  **in the game folder**.
+* Enter the name of the game and click on the *Search* (🔍) button.
+  * If it did not find the right game, either try again, or copy the app ID from the Steam Store to field to the right 
+    of the *Search* (🔍) button.
+* Click the lower left *"Get DLCs for AppID"* button to fetch all available DLCs for the game.
+* Select a language and tick the options if needed.
+* Click on *"Save"*.