Update README.md

README.md

 # Phrasenerkenner
 
-https://www1.dict.cc/translation_file_request.php?l=e
+## Setup
 
+1. Run `pip install -r requirements.txt` from the project root folder.
 
+2. Download the `DE -> EN (tab-delimited, UTF8)` [dictionary file](https://www1.dict.cc/translation_file_request.php?l=e) from dict.cc.
+
+3. Unzip the downloaded archive and rename its content dictionary file to `de-en.txt`.
+
+4. Move the dictionary file into the `resources/dictionary` folder.
+
+5. Run `python setup.py` from the project root folder.
+Overwrite the dictionary database if asked to do so.
+
+
+## Optional: Integrate Other Languages Than English
+
+Note: The German to English dictionary is required regardless of other integrated languages.
+
+1. Download the desired language [dictionary file](https://www1.dict.cc/translation_file_request.php?l=e) from dict.cc.
+   **The origin language is required to be German.** 
+
+2. Unzip the downloaded archive and rename the content dictionary file to `de-target_language_code.txt`.
+Substitute `target_language_code` with the corresponding target language code.
+A ist of valid language codes is specified in the "Language Codes" section.
+
+3. Move the dictionary file into the `resources/dictionary` folder.
+
+4. Run `python setup.py` from the project root folder.
+Overwrite the dictionary database if asked to do so.
+
+## Run
+
+- To start the commandline interface run `python phrasenerkenner.py` from the project root folder.
+
+- To start the GUI application run `python GUI_start.py` from the project root folder.
+
+
+## Language Codes
+
+The following table specifies the supported languages by dict.cc and the Phrasenerkenner.
+
+| Language   | Language Code |
+|------------|:-------------:|
+| Deutsch    |       de      |
+| English    |       en      |
+| Svenska    |       sv      |
+| Íslenska   |       is      |
+| Русский    |       ru      |
+| Română     |       ro      |
+| Français   |       fr      |
+| Italiano   |       it      |
+| Slovenčina |       sk      |
+| Português  |       pt      |
+| Nederlands |       nl      |
+| Magyar     |       hu      |
+| Suomi      |       fi      |
+| Latina     |       la      |
+| Español    |       es      |
+| Български  |       bg      |
+| Hrvatski   |       hr      |
+| Norsk      |       no      |
+| Čeština    |       cs      |
+| Dansk      |       da      |
+| Türkçe     |       tr      |
+| Polski     |       pl      |
+| Esperanto  |       eo      |
+| Српски     |       sr      |
+| Ελληνικά   |       el      |
+| Босански   |       bs      |
+| Shqip      |       sq      |