added acknowledgment

README.md

 # FACT helper file
 
-TBD
+This library offers two functions:
 
-[Copyleft Fraunhofer FKIE 2019](./LICENSE)
+```python
+from fact_helper_file import get_file_type_from_binary, get_file_type_from_path
+
+get_file_type_from_binary(b'[...]')
+get_file_type_from_path('/path/to/file')
+```
+
+The result is a dictionary with keys `['mime', 'full']` offering full file type string as well as mime string.
+
+Why use? Because the library uses the extended magic library of [FACT](https://github.com/fkie-cad/FACT_core) as default before falling back on the system magic library if nothing is detected.
+
+
+## Acknowledgments
+This project is partly financed by [German Federal Office for Information Security (BSI)](https://www.bsi.bund.de) and others.
+
+## License
+```
+    Firmware Analysis and Comparison Tool (FACT) extractor
+    Copyright (C) 2015-2019  Fraunhofer FKIE
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    Some plug-ins may have different licenses. If so, a license file is provided in the plug-in's folder.
+```