updated readme

README.md

@@ -1,6 +1,19 @@
 # tagparser
 C++ library for reading and writing MP4 (iTunes), ID3, Vorbis and Matroska tags.
 
+## Supported formats
+The tag library can read and write the following tag formats:
+- iTunes-style MP4 tags (MP4-DASH is supported)
+- ID3v1 and ID3v2 tags
+- Vorbis comments
+- Matroska/WebM tags and attachments
+
+The tag library can also parse technical information such as the ID, format, bitrate,
+duration and timestamps of the tracks.
+It also allows to inspect and validate the element structure of MP4 and Matroska files.
+
+For examples check out the CLI interface of my tageditor (also on Git).
+
 ## Build instructions
 The tagparser library depends on c++utilities and is built in the same way.
 It also depends on zlib.