Englsh about_en.md text is now complete.

app/src/main/assets/about_de.md

@@ -31,4 +31,4 @@ Der Source Code der App ist unter https://github.com/mh-/corona-warn-companion-a
 
 # Weiteres
 - Die App dient rein privaten Zwecken, mit ihr wird kein geschäftlicher Zweck verfolgt.
-- Die App ist kein "Hacker-Tool". Sie liest lediglich Daten aus dem Speicher Deines eigenen Geräts aus, die dort unverschlüsselt abgelegt sind.
+- Die App ist kein "Hacker-Tool". Sie liest lediglich Daten aus dem Speicher Deines eigenen Geräts aus, die dort ohne zusätzliche Verschlüsselung abgelegt sind.

app/src/main/assets/about_en.md

@@ -1,2 +1,34 @@
 © 2020  Michael Huebler and other contributors.
 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+# Features
+This app helps you to better understand warnings of the official Corona-Warn-App.
+
+**ATTENTION:** THE APP REQUIRES ROOT PERMISSIONS. Without root permissions, only a demo mode is possible that cannot access your risk encounters.
+
+### What the app does:
+1. The app reads the Rolling Proximity IDs recorded by your device from the Exposure Notifications database (this is only possible with root permissions, which is why the official Corona-Warn-App cannot display these details).  
+   ![-Example Recorded Encounters-](file:///android_asset/rpis_en.png)
+2. The app downloads the Diagnosis Keys from the official Corona-Warn-Server. It downloads the keys published daily for the last few days and the keys published every hour for today. Therefore, different information than in the official Corona-Warn-App might be displayed.  
+   ![-Example Diagnosis Keys-](file:///android_asset/dks_en.png)
+3. The app compares both in order to find matches (risk encounters).  
+   ![-Example Matches-](file:///android_asset/matches_en.png)
+
+If risk encounters are found, it shows the details:
+At which times and with which radio attenuation (roughly corresponds to the distance) did the encounters take place, and what level of transmission risk did the encounter have.
+![-Example Details-](file:///android_asset/details_en.png)
+Note that 1 means a low and 8 means a high transmission risk.
+
+### What the app does not do:
+- The app does not process any personal data.
+- The app only accesses the internet for the purpose 2 (see above), i.e. it only downloads data from the official Corona-Warn-Server and does not send any data to other servers.
+- The app does not show any advertising.
+
+**Note:** This app has only been tested on a few devices so far, so it is possible that it will not work and/or show incorrect results.
+
+# Open Source
+The source code of the app is published at https://github.com/mh-/corona-warn-companion-android, so you can check the source code, build the app yourself, and you are also welcome to contribute to improvements.
+
+# Other
+- The app is used for private purposes only, it is not used for any business purposes.
+- The app is not a "hacking tool". It only reads data from the memory of your own device, which is stored there without additional encryption.