edited Readme.md

README.md

@@ -1,12 +1,42 @@
 # tdm_ripper
 
-## C++ core
+The tdm_ripper provides convenient access to the TDM/TDMS data format employed by
+National Instruments LabView and DIAdem.
 
-- XML parser employs pugixml https://pugixml.org/ and it's repository https://github.com/zeux/pugixml
-- analyse .tdm file
-- buffer binary .tdx data
-- convert binary data to datatypes according to given .tdm information
+## Data Format
 
-## Cython wrapper
+Datasets encoded in the TDM/TDMS format come along in pairs comprised of a
+.tdm and .tdx file. While the .tdm file is a human-readable document providing
+meta information about the dataset, the .tdx is a binary containing the actual data.
+The .tdm is represented in XML format and basically reveals what data the .tdx
+contains and how to read it. The XML tree is usually made up of several groups,
+each containing an arbitrary amount of channels.
 
-- enables use as python module
+## Usage
+
+Although the package is built upon a C++ core, which decodes the data, it may be
+used as a Python module, as well, by interfacing the C++ library with a Cython
+wrapper.
+
+### C++ core
+
+- In order to parse the XML tree of the .tdm file, the library employs pugixml:
+  https://pugixml.org/ and https://github.com/zeux/pugixml
+- The package currently supports the following datatypes:
+  - eInt8Usi: 8 byte
+  - eInt16Usi: 16 byte
+  - eInt32Usi: 32 byte
+  - eInt64Usi: 64 byte
+  - eUInt8Usi: 8 byte
+  - eUInt16Usi: 16 byte
+  - eUInt32Usi: 32 byte
+  - eUInt64Usi: 64 byte
+  - eFloat32Usi: 32 byte
+  - eFloat64Usi: 64 byte
+- main.cpp contains an example of how the C++ library might be used to provide
+  the channels and groups of the dataset.
+
+### Python module
+
+- The library may also be used as a Python module and supports the use of
+  group channels in NumPy arrays.