Update README.md

Author: jia3ep

README.md

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+# Tools to manipulate files from Z80 Spectrum diskettes #
+
+Here's a set of utils to manipulate files that were copied from TR-DOS diskettes. The tools were written to simplify the following workflow:
+
+1. Grab diskette image using Hobbeta tool.
+2. Strip the file header.
+3. Convert resulting Zeus Z80 file to the plain text format.
+
+It's very easy to use. Download the package, run `setup.py`, invoke in the following way:
+```
+$ python -m zxtools.hobeta strip input.hobetta result.zeus
+$ python -m zxtools.zeus2txt result.zeus listing.txt
+```